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9(X+Y)的八次方乘以(X-Y)的七次方除以【3(X+Y)³·(X-Y)³】²
人气:234 ℃ 时间:2019-09-29 01:10:05
解答
9(X+Y)的八次方乘以(X-Y)的七次方除以【3(X+Y)³·(X-Y)³】²
=9(x+y)^8*(x-y)^7/9*(x+y)^6*(x-y)^6
=(x+y)²(x-y)
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