数学
数学易错题:4*2^n*2^n-1和(x-y)^3*(x-y)^2*(y-x)

2019-06-02

数学易错题:4*2^n*2^n-1和(x-y)^3*(x-y)^2*(y-x)
优质解答
4*2^n*2^n-1
=2^2*2^n*2^n-1
=2^(2+n+n-1)
=2^(2n+1)
(x-y)^3*(x-y)^2*(y-x)
=(x-y)^3*(x-y)^2*[-(x-y)]
=-(x-y)^6
4*2^n*2^n-1
=2^2*2^n*2^n-1
=2^(2+n+n-1)
=2^(2n+1)
(x-y)^3*(x-y)^2*(y-x)
=(x-y)^3*(x-y)^2*[-(x-y)]
=-(x-y)^6
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