2(x-3y)² — 3(x-3y)³ —(3y-x)²+(3y-x)³

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2(x-3y)²—3(x-3y)³—(3y-x)²+(3y-x)³2(x-3y)²—3(x-3y)³—(3y-x)²+(3y-x)

2(x-3y)² — 3(x-3y)³ —(3y-x)²+(3y-x)³
2(x-3y)² — 3(x-3y)³ —(3y-x)²+(3y-x)³

2(x-3y)² — 3(x-3y)³ —(3y-x)²+(3y-x)³
2(x-3y)² — 3(x-3y)³ —(3y-x)²+(3y-x)³
=2(x-3y)² — 3(x-3y)³ —(x-3y)²-(x-3y)³
=(x-3y)² — 4(x-3y)³

自己解答呗,2(x-3y)² -3(x-3y)³ -(3y-x)²+(3y-x)³
=2(x-3y)² - 3(x-3y)³ -(x-3y)²-(x-3y)³
=(x-3y)² - 4(x-3y)³
这个绝对正确哦!老师讲过了!(*^__^*) 嘻嘻