25(y-x)^2-16(x+y)^2因式分解
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25(y-x)^2-16(x+y)^2因式分解25(y-x)^2-16(x+y)^2因式分解25(y-x)^2-16(x+y)^2因式分解=[5(y-x)]^2-[4(x+y)]^2=[5(y-x)+
25(y-x)^2-16(x+y)^2因式分解
25(y-x)^2-16(x+y)^2因式分解
25(y-x)^2-16(x+y)^2因式分解
=[5(y-x)]^2-[4(x+y)]^2
=[5(y-x)+4(x+y)][5(y-x)-4(x+y)]
=(-x+9y)(-9x+y)
这里考察的就是平方差公式!
=[5(y-x)]^2-[4(x+y)]^2
=[5(y-x)+4(x+y)][5(y-x)-4(x+y)]
=(-x+9y)(-9x+y)
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