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a) 456 + ( x - 357 ) = 1362
x - 357=1362-456
x - 357=906
x=906+357
x=1263
b) ( 2345 - x) - 183 = 2014
2345 - x=2014+183
2345 - x=2197
x=2345-2197
x=148
c) ( x - 2005 ) . 2006 = 0
x - 2005 =0:2006
x - 2005 =0
x=0+2005
x=2005
d) 480 + 45 . 4 = ( x + 125) : 5 + 260
480 + 180 = ( x + 125) : 5 + 260
660=( x + 125) : 5 + 260
( x + 125) : 5 + 260=660
( x + 125) : 5=660-260
( x + 125) : 5=400
x + 125 =400.5
x + 125 =2000
x=20000-125
x=1975
e) 2005 . ( x - 2006) =2005
x - 2006=2005:2005
x - 2006=1
x=1+2006
x=2007
g) [( x + 50) . 50 - 50] : 50 = 50
( x + 50) . 50 - 50=50.50
( x + 50) . 50 - 50=2500
( x + 50) . 50=2500+50
( x + 50) . 50=2550
x + 50=2550:50
x + 50=51
x=51-50
x=1
Bạn Huyền ơi ở chỗ câu d mình ko hiểu tại sao 400.5=2000 mà ở dưới lại ghi 20000-125
1. a. 1234.2014+2014.8766
= 2014.(1234+8766)
= 2014.10000
= 20140000
b. 1357.2468-2468.357
= 2468.(1357-357)
= 2468.1000
= 2468000
c. (14678:2+2476).(2576-2575)-> (nếu hợp lí thì chỗ này phải là 2576)
= (7339+2476).1
= 9815.1
= 9815
d. (195-13.15) : (1945+1014)
= (195-195) : (1945+1014)
= 0 : (1945+1014)
= 0
2. a. 456+(x-357)=1362
=> x-357=1362-456
=> x-357=906
=> x=906+357
=> x=1263
b. (2345-x)-183=2014
=> 2345-x=2014+183
=> 2345-x=2197
=> x=2345-2197
=> x=148
c. (x-2005).2006=0
=> x-2005=0:2006
=> x-2005=0
=> x=2005+0
=> x=2005
d. 480+45.4=(x+125):5+260
=> 480+180=(x+125):5+260
=> 660=(x+125):5+260
=> (x+125):5=660-260
=> (x+125):5=400
=> x+125=400.5
=> x+125=2000
=> x=2000-125
=> x=1875
e. 2005.(x-2006)=2005
=> x-2006=2005:2005
=> x-2006=1
=> x=1+2006
=> x=2007
g. [(x+50).50-50]:50=50
=> (x+50).50-50=50.50
=> (x+50).50-50=2500
=> (x+50).50=2500+50
=> (x+50).50=2550
=> x+50=2550:50
=> x+50=51
=> x=51-50
=> x=1
a) 456 + (x - 357) = 1362
x - 357 = 1362 - 456
x - 357 = 906
x = 906 + 357
x = 1263
Vậy x = 1263
b) (x -2005) . 2006 = 0
x - 2005 = 0 : 2006
x - 2005 = 0
x = 0 + 2005
x = 2005
Vậy x = 2005
c) 2005 . ( x -2006 ) = 2005
x - 2006 = 2005 : 2005
x - 2006 = 1
x = 1 + 2006
x = 2007
Vậy x = 2007
d) (2345 -x ) - 183 = 2014
2345 - x = 2014 + 183
2345 - x = 2197
x = 2345 - 2197
x = 148
Vậy x = 148
e) 480 + 45 .4 = ( x + 125 ) : 5 + 260
480 + 180 = ( x + 125 ) : 5 + 260
660 = ( x + 125 ) : 5 + 260
=> ( x + 125 ) : 5 + 260 = 660
( x + 125 ) : 5 = 660 - 260
( x + 125 ) : 5 = 400
x + 125 = 400 . 5
x + 125 = 2000
x = 2000 - 125
x = 1875
Vậy x = 1875
a) (x - 2005 ) . 2006 = 0
x - 2005 = 0 : 2006
x - 2005 = 0
x = 0 + 2005
x = 2005
b) 2005.(x-2006) = 2005
x - 2006 = 2005 : 2005
x - 2006 = 1
x = 1 + 2006
x = 2007
c) 480+45.4=(x+125) : 5 + 260
480 + 180 = (x+125) : 5 + 260
660 = ( x + 125 ) : 5 + 260
660 - 260 = ( x+ 125 ) : 5
400 = ( x + 125 ) : 5
400 x 5 = x + 125
2000 = x + 125
2000 - 125 = x
1875 = x
tương tự
a)(x-2005).2006=0
=>x-2005=0
=>x=2005
b)480+45.4=(x+125):5+260
=>480+180=(x+125):5+260
=>660=(x+125):5+260
=>(x+125):5=400
=>x+125=2000
=>x=1875
c)2005.(x-2006)=2005
=>x-2006=1
=>x=2007
d){(x+50).50-50}:50=50
=>(x+50).50-50=2500
=>(x+50)*50=2550
=>x+50=51
=>x=1
a) 456 + (x - 357) = 1362
=>x - 357 = 1362 - 456
=>x - 357 = 906
=>x = 906 + 357
=>x = 1263
b)(2345 - x) - 183 = 2014
=>2345 - x = 2014 + 183
=> 2345 - x = 2197
=> x = 2345 - 2197 = 148
c)(x-2005).2006=0
=>x-2005=0
=>x=2005
d)480+45.4=(x+125):5+60
=>480+180=x:5+125:5+60
=>660=x:5+25+60
=>660=x:5+85
=>x:5=660-85=575
=>x=575.5=2875
e)2005.(x-2006)=2005
=>x-2006=1
=>x=2--7
g)[(x+50).50-50]:50=50
=>(x+50).50-50=1
=>(x+50).50=51
=>x+50=51.50=2550
=>x=2550-50
=>x=2500
a) 456 + (x - 357) = 1362
=>x - 357 = 1362 - 456
=>x - 357 = 906
=>x = 906 + 357
=>x = 1263
b)(2345 - x) - 183 = 2014
=>2345 - x = 2014 + 183
=> 2345 - x = 2197
=> x = 2345 - 2197 = 148
c)(x-2005).2006=0
=>x-2005=0
=>x=2005
d)480+45.4=(x+125):5+60
=>480+180=x:5+125:5+60
=>660=x:5+25+60
=>660=x:5+85
=>x:5=660-85=575
=>x=575.5=2875
e)2005.(x-2006)=2005
=>x-2006=1
=>x=2--7
g)[(x+50).50-50]:50=50
=>(x+50).50-50=1
=>(x+50).50=51
=>x+50=51.50=2550
=>x=2550-50
=>x=2500
5500 - 375 + 1182 = 6307
8376 - 2453 - 699 = 5224
1054 + 987 - 1108 = 933
1540: 11 + 1890: 9 + 982 = 140 + 210 + 982 = 1332
7080-(1000-536) = 6616
2806-(1134+950)-280 = 2806 - 2084 - 280 = 442
1953 + (17432-56.223):16 = 1953 + 4944:16 = 2262
5347 +(2376-734) = 6989
136.(668-558)-404.25 = 14960 - 10100 = 4860
6010-(130.52-68890:83) = 6010 - (6760 - 830) = 80
Bài hơi dài nên nếu mình có làm sai thì bạn thông cảm nha
(x - 2005) x 2006 = 0
<=> x - 2005 = 0
<=> x = 2005
Vậy x = 2005
\(456+\left(x-357\right)=1362\) \(\left(2345-x\right)-183=2014\)
\(x-357=906\) \(2345-x=2197\)
\(x=1263\) \(x=148\)
\(\left(x-2005\right).2006=0\) Phần sau tương tự thế !
\(x-2005=0\)
\(x=2005\)
\(a,456+\left(x-357\right)=1362\)
\(x-357=1362-456\)
\(x-357=906\)
\(x=1263\)
\(b,\left(2345-x\right)-183=2014\)
\(2345-x=2197\)
\(x=148\)
\(c,\left(x-2005\right)\times2006=0\)
\(x-2005=0\)
\(x=2005\)
\(d,480+45\times4=\left(x+125\right):5+260\)
\(480+180=\left(x+125\right):5+260\)
\(660=\left(x+125\right):5+260\)
\(400=\left(x+125\right):5\)
\(x+125=2000\)
\(x=1875\)
\(e,2005\times\left(x-2006\right)=2005\)
\(x-2006=1\)
\(x=2007\)
\(g,[\left(x+50\right)\times50-50]:50=50\)
\(\left(x+50\right)\times50-50=2500\)
\(\left(x+50\right)\times50=2550\)
\(x+50=51\)
\(x=1\)
a, 456 + (x - 357) = 1362
x - 357 = 1362 - 456
x - 357 = 906
x = 906 + 357 = 1263
b, (2345 - x) - 183 = 2014
2345 - x = 2014 + 183
2345 - x = 2197
x = 2345 - 2197
x = 148
c, (x - 2005) . 2006 = 0
x - 2005 = 0 : 2006
x - 2005 = 0
x = 0 + 2005
x = 2005
d, 480 + 45 . 4 = (x + 125) : 5 + 260
480 + 180= (x + 125) : 5 + 260
660 = (x + 125) : 5 + 260
(x + 125) : 5 = 660 - 260
(x + 125) : 5 = 400
x + 125 = 400 . 5
x + 125 = 2000
x = 2000 - 125
x = 1975
e, 2005 . (x - 2006) = 2005
x - 2006 = 2005 : 2005
x - 2006 = 1
x = 2006 + 1
x = 2007
g, [(x + 50) . 50 - 50] : 50 = 50
(x + 50) . 50 - 50 = 50 . 50
(x + 50) . 50 - 50 = 2500
(x + 50) . 50 = 2500 + 50
(x + 50) . 50 = 2550
x + 50 = 2550 : 50
x + 50 = 51
x = 51 - 50
x = 1
- Thường thì mấy bài tìm x cấp 2 sẽ phải có thêm phần 'Vậy x = ...' nên bạn thêm vào thì tốt hơn :)
- Chú ý viết dấu nhân = . để tránh nhầm lẫn với x.
a) 456 + ( x - 357 ) = 1362
=> x - 357 = 906
=> x = 1263
b) ( 2345 - x ) - 183 = 2014
=> 2345 - x = 2197
=> x = 148
c) ( x - 2005 ) . 2006 = 0
=> x - 2005 = 0
=> x = 2005
d) 480 + 45 . 4 = ( x + 125 ) : 5 + 260
=> 660 = ( x + 125 ) : 5 + 260
=> ( x + 125 ) : 5 + 260 = 660
=> ( x + 125 ) : 5 = 400
=> x + 125 = 2000
=> x = 1975
e) 2005 . ( x - 2006 ) = 2005
=> x - 2006 = 1
=> x = 2007
g) [( x + 50 ) . 50 - 50] : 50 = 50
=> ( x + 50 ) . 50 - 50 = 2500
=> ( x + 50 ) . 50 = 2550
=> x + 50 = 51
=> x = 1
Tìm x, biết:
a) 456 + (x - 357) = 1362
x - 37 = 1362 - 456
x - 37 = 906
x = 906 + 37
x = 943
b) (2345 - x) - 183 = 2014
2345 - x = 2014 + 183
2345 - x = 2197
x = 2345 - 2197
x = 148
c) (x - 2005) x 2006 = 0
x - 2005 = 0 : 2006
x - 2005 = 0
x = 0 + 2005
x = 2005
e) 2005 x (x - 2006) = 2005
x - 2006 = 2005 : 2005
x - 2006 = 0
x = 0 + 2006
x = 2006
d) 480 + 45 x 4 = ( x + 125 ) : 5 + 260
480 + 180 = ( x + 125 ) : 5 + 260
660 = ( x + 125 ) : 5 + 260
660 - 260 = ( x + 125 ) : 5
400 = ( x + 125 ) : 5
400 x 5 = x + 125
2000 = x + 125
2000 - 125 = x
1975 = x
g) [ ( x + 50 ) x 50 - 50 ] : 50 = 50
( x + 50 ) x 50 - 50 = 50 x 50
( x + 50 ) x 50 - 50 = 2500
( x + 50 ) x 50 = 2500 + 50
( x + 50 ) x 50 = 2550
x + 50 = 2550 : 50
x + 50 = 51
x = 51 - 50
x = 1
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