(1)(2ab+3b2-5)-(3ab+3b2-8)(2)x2?x3+x7÷x2(3)107÷(103÷102)(4)(x-y)3?(x-y)2?(y-
(1)(2ab+3b2-5)-(3ab+3b2-8)(2)x2?x3+x7÷x2(3)107÷(103÷102)(4)(x-y)3?(x-y)2?(y-x)...
(1)(2ab+3b2-5)-(3ab+3b2-8)(2)x2?x3+x7÷x2(3)107÷(103÷102)(4)(x-y)3?(x-y)2?(y-x)
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