Question

(y-x)的2次方+x(x-y)的3次方-(y-x)的4次方

Answer 1

题目应是 [(x-y)的四次方+6(y-x)的三次方+8(x-y)的2次方]÷2(x-y)的2次方

= [(x-y)^4-6(x-y)^3+8(x-y)^2]÷2(x-y)^2

=1/2(x-y)^2-3(x-y)+4

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