Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)73+86+968+914+3032
= (86 + 914) +(968 + 3032) + 73
= 1000 + 4000 + 73
= 5073
b)341.67+341.16+659.83
=341 (67 + 16) + 659 * 83
= 341 * 83 + 659 * 83
= (341+ 659) * 83
= 1000 * 83
= 830000
c)252-84:21+7
= 252 - 2 +7
=257
d)4.8.25.125.27
= (8 * 125) (4* 25) * 27
= 1000 * 100 * 27
= 2700000
e)34+35+36+37-24-25-26-27
= (34-24) + (35-25) + (36-26) + (37-27)
= 10 + 10 + 10 + 10
= 40
g)1-2+3-4+...-98+99
= (1 + 99) + (-2-98) + .....+ (-48 - 52) + (49 + 51) - 50
= 100 - 50
= 50
h)1-4+7-10+...-100+103
Bài 2:Tìm số nguyên x,biết:
l)3636:(12.x-91)=36
3636 : (12x - 91) = 36
12x - 91 = 101
12x = 192
x= 16
m)(x:23+45).67=8911
x: 23 + 45 = 133
x : 23 = 88
x= 88/23
n)[(6.x-39):7].4=12
6x - 39 = 3
6x = 42
x=7
p)128-3(x+4)=23
3(x+4) = 105
x+4= 35
x= 31
q)[(4.x+28).3+55]:5=35
(4x + 28)*3 +55 = 175
(4x + 28) * 3 = 120
4x + 28 = 40
4x = 12
x=3
r)123-5.(x+4)=38
5(x+4) = 85
x+4 = 17
x= 13
t)11-(53+x)=97
53 + x = -86
x= -139
i)23.75+25.23+180
= 23(75+25) + 180
= 2300 + 180
= 2480
\(a\frac{31}{23}-\left(\frac{7}{23}+\frac{8}{23}\right)\)
\(=\frac{31}{23}-\frac{7}{23}-\frac{8}{23}\)
\(=\frac{16}{23}\)
Hot
tốt
!
a)\(\frac{31}{23}-\left(\frac{7}{23}+\frac{8}{23}\right)=\frac{31}{23}-\frac{8}{23}+\frac{7}{23}=1+\frac{7}{23}=1\frac{7}{23}\)
b)\(\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)=\left(\frac{13}{41}+\frac{28}{41}\right)+\left(\frac{79}{67}-\frac{12}{67}\right)-\frac{1}{3}=1+1-\frac{1}{3}\)
\(=2-\frac{1}{3}=\frac{5}{3}\)
`a,`
`31/23-(7/32+8/23)`
`=31/23-7/32-8/23`
`=(31/23-8/23)-7/32`
`=1-7/32=25/32`
`b,`
`38/45-(8/45-17/51-3/11)`
`=38/45-8/45+17/51+3/11`
`= (38/45-8/45)+17/51+3/11`
`=2/3+17/51+3/11`
`=1+3/11=14/11`
`c,`
`(1/3+12/67+13/41)-(79/67-28/41)`
`= 1/3+12/67+13/41-79/67+28/41`
`= 1/3+(12/67-79/67)+(13/41+28/41)`
`= 1/3+(-1)+1=1/3+(-1+1)=1/3+0=1/3`
`d,`
`1/5+(-1/6)+1/7+(-1/8)+1/9+1/8+(-1/7)+1/6+(-1/5)`
`= (1/5+ -1/5)+(-1/6+1/6)+(1/7+ -1/7)+(-1/8 +1/8)+1/9`
`= 0+0+0+0+1/9=1/9 .`
a 67.36+67.65-67= 67.(36+65−1)(36+65−1) = 67. 100 = 6700
b) (723.45+723.4):725(723.45+723.4):725 = 723.(45+4):725=723.72:725=1
a) 67.36+67.65−676700
b) 1(723.45+723.4): 7
a) 67.36+67.65−6767.36+67.65−67;
= 67(36 + 65 - 1)
= 67 x 100 = 6700.
b, (723.45+723.4): 725.
= [ 7(45 + 4)] : 7
= 7 x 49 : 7
= 49
67.36+67.65−67
=67.(36+65−1)=67.(36+65−1)
=67.100=6=67.100=6 700700
b) (723.45+723.4): 725(723.45+723.4): 725
=723.(45+4): 725=723.(45+4): 725
=723.49:725=723.49:725
=723.72 : 725=723.72 : 725
=725 :725=1=725 :725=1.
a) 67.36+67.65−6767.36+67.65−67
= 67.36+67.65−6767.(36+.65-1)
=67.100
=6700
b) (723.45+723.4):725
=723.(45+4):725
=723.72:725
=723+2-25
=7
a) 67.36+67.65−6767.36+67.65−67
=67.(36+65−1)=67.(36+65−1)
=67.100=6=67.100=6 700700
b) (723.45+723.4): 725(723.45+723.4): 725
=723.(45+4): 725=723.(45+4): 725
=723.49:725=723.49:725
=723.72 : 725=723.72 : 725
=725 :725=1=725 :725=1.
45a) 67.36 + 67.65 - 67
= 67.36.65
=156780
b) (723 . 45 + 723 . 4) : 725
= (723 . 45 . 4) : 725
= (723 . 180 ) : 725
= 180 . 72
= 2520
a) 67.36 + 67.65 - 67
= 67.(36 + 65 - 1)
= 67.100 = 6700.
b) (723.45+723.4): 725(723.45+723.4): 725
=723.(45+4): 725=723.(45+4): 725
=723.49:725=723.49:725
=723.72 : 725=723.72 : 725
=725 :725=1=725 :725=1.
a) 67.36+67.65−6767.36+67.65−67=2412+4355-67=6767-67=6700
b)(723.45+723.4):725=723.(45+4):725=723.49:725=723.72:725=725:725=70 (723.45+723.4): 725: 7
a) 67.36+67.65-67
=67.(65+36-1)
=67.100
=6700
b) (723.45+723.4): 725
=7.23.(45+4):725
=7.23.49:725
=723.49:723.7.7
=49.1:49
=1
a) 67.36+67.65−6767.36+67.65−67
=67.(36+65−1)=67.(36+65−1)
=67.100=6=67.100=6 700700
b) (723.45+723.4): 725(723.45+723.4): 725
=723.(45+4): 725=723.(45+4): 725
=723.49:725=723.49:725
=723.72 : 725=723.72 : 725
=725 :725=1=725 :725=1.
a) 67.36+67.65-67
= 67.( 36+65 - 1 )
= 67.( 101 - 1 )
= 67.100
= 6700
b) (7 23.45+723.4): 725
= [ 7^23.( 45+4) ] : 7^25
=[7^23.49] : 7^25
= 7^25 : 7^25
= 7^0=1
a) 67.36+67.65−6767.36+67.65−67
=67.(36+65−1)=67.(36+65−1)
=67.100=6=67.100=6 700700
b) (723.45+723.4): 725(723.45+723.4): 725
=723.(45+4): 725=723.(45+4): 725
=723.49:725=723.49:725
=723.72 : 725=723.72 : 725
=725 :725=1=725 :725=1.
a) 67.36+67.65−67
= 67.(36 + 65 - 67)
= 67.34
= 2278
b) (723.45+723.4): 725(7 mũ 23. 45 +
7 mũ 23. 4) : 7 mũ 23
= 7 mũ 23. (45 + 4) : 7 mũ 25
= 7 mũ 23. 49 : 7 mũ 25
= 7 mũ 23. 7 mũ 2 : 7 mũ 25
= 7 mũ 25 : 7 mũ 25
= 1
a) 67.36+67.65−6767.36+67.65−67
=67.(36+65−1)=67.(36+65−1)
=67.100=6=67.100=6 700700
b) (723.45+723.4): 725(723.45+723.4): 725
=723.(45+4): 725=723
.(45+4): 725
=723.49:725=723.49:725
=723.72 : 725=723.72 : 725
=725 :725=1=725 :725=1.
67.36+67.65
a) 67.3 67.36+67.65−6767.36+67.65−67
=67.{36-65+ 1}
=67.0
=067.36+67.65−
a)67.36+67.65-67
=67.36+67.65-67.1
=67.(36+65-1)
=67.100
=6700
.b)(7^23.45+7^23.4): 7^25
=[7^23.(45+4)]: 7^25
=(7^23.49): 7^25
=(7^23.7^2): 7^25
=7^25 : 7^25
=7^1=7
a) 67.36+67.65-67 b) (723.45+723.4) : 725
=67.(36+65-1) = 723.(45+4):725
=67.100 = 723.72:725
=6700 = 1
a) 67.36+67.65−6767.36+67.65-67= 67.(36+65-1)= 67.100= 6700
b)(7
23.45+7
23.4): 7
25=723.(45+4):725=723.72:725=725:725=1
(723.45+723.4): 72
a)
a) 67.36+67.65-67 67 .(36+65-67) 67.34 2278
a) 67.36+67.65−6767.36+67.65−67 b) (723.45 + 723.4) :725
= 67. (36 + 65-1) = 723.(45 + 4) : 725
=67 . 101 - 1 = 723. 49 : 725
= 67 .100 = 723.72 : 725
= 6700 = 725 : 725
= 70
= 1
a) 67.36+67.65−6767.36+67.65−67;
= 67(36 + 65 - 1)
= 67 x 100 = 6700.
b, (7
23.45+7
23.4): 7
.
= [ 7(45 + 4)] : 7
= 7 x 49 : 7
=343:7
= 49
a) 67.36+67.65−6767.36+67.65−67
=67.(36+65−1)=67.(36+65−1)
=67.100=6=67.100=6 700700
b) (723.45+723.4): 725(723.45+723.4): 725
=723.(45+4): 725=723.(45+4): 725
=723.49:725=723.49:725
=723.72 : 725=723.72 : 725
=725 :725=1=725 :725=1.
=723.(45+4): 725
a) 67.36+67.65−67
=67.36+67.65−67.1
=67(36+65-1)
=67.100
=6700
a) 67.36+67.65-67
=67.36+67.67-67.1
=67.(36+65-1)
=67.100
=6700