a(b-c) - c(c-b )
=> a ( b -c ) - c [ - ( b - c ) ]
=> a ( b -c ) + c ( b - c )
= ( a + c ) ( b - c )
trả lời\
câu
b và c
cũng làm tương tự nhá
\(a,a\left(b-c\right)-c\left(c-b\right)\)
\(=a\left(b-c\right)-c\left[-\left(b-c\right)\right]\)
\(=a\left(b-c\right)+c\left(b-c\right)\)
\(=\left(a+c\right)\left(b-c\right)\)
\(b,2a\left(x-y\right)-\left(y-x\right)+3b\left(x-y\right)\)
\(=2a\left(x-y\right)+\left(x-y\right)+3b\left(x-y\right)\)
\(=\left(2a+1+3b\right)\left(x-y\right)\)
\(x\left(x-y\right)+y\left(y-x\right)-3\left(x-y\right)\)
\(=x\left(x-y\right)-y\left(x-y\right)-3\left(x-y\right)\)
\(=\left(x-y-3\right)\left(x-y\right)\)
~~ MỆT ~~ những câu sau lm nốt nhé =='
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