(2x-y)的13次方÷[﹙2x﹣y﹚的3次方]的2次方除以[﹙y-2x﹚的2次方]的3次方,其中x=2,y=﹣1

问题描述:

(2x-y)的13次方÷[﹙2x﹣y﹚的3次方]的2次方除以[﹙y-2x﹚的2次方]的3次方,其中x=2,y=﹣1

(2x-y)^13÷[(2x-y)^3]^2÷[(y-2x)^2]^3
=(2x-y)^13÷(2x-y)^6÷{[-(2x-y)]^2}^3
=(2x-y)^7÷[(2x-y)^2]^3
=(2x-y)^7÷(2x-y)^6
=2x-y
=2×2-(-1)
=4+1
=5