1. (x-y)(m-3) * (y-x)2 * (x-y)n * (y-x)5
=(x-y)(m-3+n) * (y-x)(2+5)
=(x-y)(m+n-3) * (y-x)7=(x-y)(m+n-3) * [-(x-y)7]=-(x-y)(m+n+4)(后为次方)
2. (a)3 * (a)4 *a+[(a)2]4+[(-2a)4]2
=(a)8+(a)8+4(a)8=6(a)8(8为次方)
3.[(-2x)2]3+[(-4x)3]2-(2x)2 *(-x)4
=-8(x)6+16(x)6-4(x)2*(x)4=8(x)6-4(x)6=4(x)6(6为次方)
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