-(x-y)三次方(y-x)四次方-(x-y)七次方

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-(x-y)三次方(y-x)四次方-(x-y)七次方-(x-y)三次方(y-x)四次方-(x-y)七次方-(x-y)三次方(y-x)四次方-(x-y)七次方原式=(y-x)³(y-x)^4+

-(x-y)三次方(y-x)四次方-(x-y)七次方
-(x-y)三次方(y-x)四次方-(x-y)七次方

-(x-y)三次方(y-x)四次方-(x-y)七次方
原式 = (y - x)³ (y - x)^ 4 + (y - x)^ 7
= (y - x)^ 7 + (y - x)^ 7
= 2(y - x)^ 7

-(x-y)³(y-x)^4-(x-y)^7
=(x-y)³(x-y)^4-(x-y)^7
=(x-y)^7-(x-y)^7
=0

-(x-y)三次方(y-x)四次方-(x-y)七次方
= (y-x)三次方(y-x)四次方+(y-x)七次方
= (y-x)7次方+(y-x)七次方
= 2 (y-x)七次方