计算 [ ( x+y ) ( x-y ) ] ^ 9 ÷ ( y-x )^ 8 ÷ ( -x-y )^9
计算 [ ( x+y ) ( x-y ) ] ^ 9 ÷ ( y-x )^ 8 ÷ ( -x-y )^9
数学人气：284 ℃时间：2020-02-18 17:52:43
优质解答
[ ( x+y ) ( x-y ) ] ^ 9 ÷ ( y-x )^ 8 ÷ ( -x-y )^9= ( x+y )^9 ( x-y ) ^9 ÷ (x-y )^ 8 ÷[- (x+y )^9]=-[ ( x+y )^9÷( x+y )^9][ ( x-y ) ^9 ÷ (x-y )^ 8]=-(x-y)=y-x
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