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43 x 27 + 93 x 43 + 57 x 61 + 59 x 57
= 43 x ( 27 + 93 ) + 57 x ( 61 + 59 )
= 43 x 120 + 57 x 120
= 120 x ( 43 + 57 )
= 120 x 100
= 1200
b) 64 x 6 + 81 x 4 + 17 x 6
= 6 x ( 64 + 17 ) + 81 x 4
= 6 x 81 + 81 x 4
= 81 x ( 6 + 4 )
= 81 x 10
= 810
A) =43 x (27+93)+57*(61+59)
=43*120+57*120
=120*(43+57)
=120*100
=12000
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\(x\cdot3+x\cdot2+x+x\cdot93=15000\)
=>\(x\left(93+1+3+2\right)=15000\)
=>\(x\cdot99=15000\)
=>\(x=\dfrac{15000}{99}=\dfrac{5000}{33}\)
\(x\times3+x\times2+x+x\times93=15000\)
\(x\times\left(3+2+1+93\right)=15000\)
\(x\times99=15000\)
\(x=15000:99\)
\(x=\dfrac{5000}{33}\)
Vậy: ...
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2*(x+3)+3*(x+4)+4*(x+5)-8*x=93
2*x+2*3+3*x+3*4+4*x+4*5-8*x =93
(2*x+3*x+4*x-8*x)+(2*3+3*4+4*5)=93
x*(2+3+4-8)+(6+12+20) =93
x*1+38 =93
x =93-38
x =55
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93 + 7 : x = 112
7 : x = 112 - 93
7 : x = 19
x = 7 : 19
x = 7/19
84 : x - 6 = 15
84 : x = 16 + 5
84 : x = 21
x = 84 : 21
x = 4
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3 * x + 3 + 5 * x + 10 =93
8 * x = 93 - 13
8 * x = 80
x = 80 / 8 =10
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93 - 3 x ( x + 1 ) = 42
3 x (x + 1) = 93 - 42
3 x (x + 1) = 51
x + 1 = 51 : 3
x + 1= 17
x = 17 - 1
x = 16
vậy____