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d, X/8*32+X/3*18-X/5*10=120
X*32/8+X*18/3-X*10/5=120
32X/8+18X/3-10X/5=120
4X+6X-2X=120
8X=120
X=120/8
X=15
222 x 5 = 111 x 2 x 5 = 1110
Đúng hay sai
3 x 125 x 2 x 8 = (3 x2 ) x (125 x 8) = 6000
Đúng hay sai
342 x 5 = 340 + 2 x 5 = 340 x 10 = 3400
Đúng hay sai
25 x 8 x 9 = (25 x 4) x (4 x 9) = 100 x 36 = 3600
Đúng hay sai
2 x 8 x 50 x 25 x 125
= ( 125 x 8 ) x ( 50 x 2 ) x 25
= 1000 x 100 x 25
=2500000
4 x 125 x 25 x 8
= ( 125 x 8 ) x ( 25 x 4 )
= 1000 x 100
=100000
2 x 3 x 4 x 5 x 50 x 25
= ( 25 x 4 ) x ( 2 x 50 ) x ( 3 x 5 )
= 100 x 100 x 15
= 150000
25 x 20 x 125 x 8 - 8 x 20 x 5 x 125
= ( 25 x 20 ) x ( 125 x 8 ) - ( 20 x 5 ) x ( 125 x 8 )
= 500 x 1000 - 100 x 1000
= 500000 - 100000
= 400000
(125 x 4 - 1000 : 2) x ( 1 x2 x 3 x... x 99 x 100)
=(500 - 500 ) x ( 1 x2 x 3 x... x 99 x 100)
=0 x ( 1 x2 x 3 x... x 99 x 100)
=0
( 125 x 4 - 1000 : 2 ) x ( 1 x 2 x 3 x ... x 99 x 100 )
Đặt A = 125 x 4 - 1000 : 2
B = 1 x 2 x 3 x ... x 99 x 100
A = 125 x 4 - 1000 : 2
A = 500 - 500
A = 0
Thay vào , ta có :
0 x ( 1 x 2 x 3 x ... x 99 x 100 )
= 0
a) \(125\times25\times8\times4\)
\(\Rightarrow\left(125\times8\right)\times\left(25\times4\right)\)
\(\Rightarrow1000\times100\)
\(\Rightarrow100000\)
\(2x3x4x8x50x25x125=\left(2x50\right)x\left(4x25\right)x\left(8x125\right)x3\)\(=100x100x1000x3=30000000\)
rút gọn :
\(\frac{150}{125}=\frac{150:25}{125:25}=\frac{6}{5}\)
\(x+\frac{3}{4}=\frac{6}{5}\)
\(x=\frac{6}{5}-\frac{3}{4}\)
\(x=\frac{9}{20}\)
\(x+\dfrac{3}{4}=\dfrac{6}{5}\Leftrightarrow x=\dfrac{6}{5}-\dfrac{3}{4}=\dfrac{24-15}{20}=\dfrac{9}{20}\)