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a) 2 x 3 x 4 x 8 x 50 x 25 x 125
= (2 x 50) x (4 x 25) x (8 x 125) x 3
= 100 x 100 x 1000 x 3
= 30 000 000
b) 45 x 128 90 x 64
= (45 x 64) x 128 90
= 2880 x 128 90
= 37 123 200
_HT_
a: \(\left(45\times46+47\times48\right)\times\left(45\times128-90\times64\right)\)
\(=\left(45\times46+47\times48\right)\times\left(45\times128-45\times2\times64\right)\)
=0
b: \(1988\times1996+1997\times11+1985\)
\(=1988\times\left(1997-1\right)+1997\times11+1985\)
\(=1988\times1997+1997\times11-1988+1985\)
=1997x(1988+11)-3
=1997x1999-3
=3992000
a) 19,17x25x4=19,17(25x4)=19,17x100=1917
b)1,79x(8x125)=1,79x1000=1790
chúc bạn học tốt
6,7 x 9,55 + 9,45 x 16,7 + 16,7 = 6,7 x 9,55 + 9,45 x 16,7 + 16,7 x 1
= 6,7 x 9,55 + 16,7 x (9.45 + 1)
=63,985 + 16,7 x 10,45
= 63,985 + 174,515
= 238,5
B, 380 : ( 38 x 2 ) = 380 : 76 = 5
C, 6/11 : 4/3 : 5/11 : 4/3 = 9/22 : 5/11 : 4/3 = 9/10 : 4/3 = 27/40
a, 2,5 x 16,27 x 4 + 7,3
= ( 2,5 x 4 ) x 16,27 + 7,3
= 10 x 16,27 + 7,3
= 162,7 + 7,3
= 170
b, 0,25 x 1,25 x 8 x 4 x 0,5
= ( 0,25 x 4 ) x ( 1,25 x 8 ) x 0,5
= 1 x 10 x 0,5
= 5
a. 2,5 X16,27X4+7,3 b.0.25X1,25X8X4X0,5
= (2,5X4) X(7,3+16,27) = (0,25X4)X(0,5X8)X1,25
=10X23,57 =1X4X1,25
=235,7 =4X1,25
= 5
k cho mình nhé
a,\(10:x+7,19:x=3\)
\(\left(10+7,19\right):x=3\)
\(17,19:x=3\)
\(\Rightarrow x=17,19:3\)
\(\Rightarrow x=5,73\)
Vậy x=5,73
b,\(6,24:x+1,26;x=10\)
\(\left(6,24+1,26\right):x=10\)
\(7,5:x=10\)
\(\Rightarrow x=7,5:10\)
Vậy x= 0,75
a) 10:x+7,19:x=3
\(\Rightarrow\)(10+7,19):x=3
\(\Rightarrow\)17,19:x=3
\(\Rightarrow\)x=17,19:3=5,73
b) 6,24:x+1,26:x=10
\(\Rightarrow\)(6,24+1,26):x=10
\(\Rightarrow\)7,5:x=10
\(\Rightarrow\)x=7,5:10=0,75
\(\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times.........\times\left(1-\frac{1}{6}\right)\)
\(=\frac{1}{2}\times\frac{2}{3}\times........\times\frac{5}{6}\)
\(=\frac{1}{6}\)
a ) 2 x 3 x 4 x 8 x 50 x 25 x 125
= 3 x 2 x 50 x 4 x 25 x 8 x 125
= 3 x ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125 )
= 3 x 100 x 100 x 1000
= 30000000
b ) 45 x 128 - 90 x 64
= 45 x ( 2 x 64 ) - 90 x 64
= ( 45 x 2 ) x 64 - 90 x 64
= 90 x 64 - 90 x 64
= 0
a) = (2.50).(4.25).(8.125).3=100.100.1000.3=30000000
b)45.128-90.64=45.128-45.2.64
=45.128-45.128
=0
a) 2 x 3 x 4 x 8 x 50 x 25 x 125
= (25 x 4) x (50 x 2) x (125 x 8) x 3
= 100 x 100 x 1000 x 3
= 30000000
b) 45 x 128 - 90 x 64
= 45 x 128 - 45 x 2 x 64
= 45 x 128 - 45 x 128
= 0
a)2x3x4x8x50x25x125
=(2x50)x(4x25)x(125x8)x3
=100x100x1000x3
=10000000x3
=30000000
b)45x128-90x64
=5760-5760
=0
a) 2 . 3 . 4 . 8 . 50 . 25 . 125
= ( 2 . 50 )( 4 . 25 )( 8 . 125) . 3
= 100 . 100 . 1000 . 3
= 10000 . 3000
= 30000000
kết quả a
= 30 000 000
kết quả b
= 0
a) 2 x 3 x 4 x 8 x 50 x 25 x 125
= 3 x 2 x 4 x 8 x 50 x 25 x 125
= 3 x ( 2 x 50 ) x ( 4 x 25 ) x ( 8 x 125 )
= 3 x 100 x 100 x 1000
= 30 000 000
b) 45 x 128 - 90 x 64
= 45 x ( 64 x 2 ) - 90 x 64
= (45 x 2) x 64 - 90 x 64
= 90 x 64 - 90 x 64
= 0
a) 2 x 3 x 4 x 8 x 50 x 25 x 125
= (2x50) x (4x25) x (8x125) x 3
= 100 x 100 x 1000 x 3
= 10000 x 1000 x 3
= 10000000 x 3
= 30000000
b) 45 x 128 - 90 x 64
= 5760 - 5760
= 0
a) 2x3x4x8x50x25x125
=(2x50)x(4x25)x(8x125)x3
=100 x100 x1000 x3
=10000000 x3
=30000000
b) 45x128-90x64
=(45x128)-(90x64)
=5760 -5760
=0
a) 30 000 000 ; b) 0
a, 2.3.4.8.50 .25.125
=(2.50).(4.25).(8.125).3
=100.100.1000.3
=100000.300
=30000000
b, 45.128-90.64
=5760 -5760
=0
thu gọn
kdddddddddddddddđgggggggggggg