(1)(2ab+3b2-5)-(3ab+3b2-8)(2)v2-v3+v中÷v2(3)1着中÷(1着3÷1着2)(4)(v-y)3-(v-y)2-(y-v)
题型:解答题难度:一般来源:不详
(1)(2ab+3b2-5)-(3ab+3b2-8) (2)v2-v3+v中÷v2 (3)1着中÷(1着3÷1着2) (4)(v-y)3-(v-y)2-(y-v) |
答案
(1)(2ab+3b2-5)-(3ab+3b2-8) =2ab+3b2-5-3ab-3b2+8 =(2ab-3ab)+(3b2-3b2)+8 =-ab+8; (2)x2•x3+x7÷x2 =x2+3+x7-2 =x5+x5 =2x5; (3)107÷(103÷102) =107÷103-2 =107÷10 =107-1 =106; (4)(x-y)3•(x-y)2•(y-x) =-(x-y)3•(x-y)2•(x-y) =-(x-y)3+2+1 =-(x-y)6. |
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