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试题原文 |
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(1)(-2xy3z2)4 =(-2)4?x4?(y3)4?(z2)4 =16x4y12z8; (2)(xy+4)(xy-4) =(xy)2-42 =x2y2-16; (3)(2x-3)(x-1) =2x2-2x-3x+3 =2x2-5x+3; (4)(54x2y-108xy2-36xy)÷(18xy) =54x2y÷18xy-108xy2÷18xy-36xy÷18xy =3x-6y-2; (5)
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=2a6b5c5; (6)(x+y)2-(x-y)2 =[(x+y)+(x-y)][(x+y)-(x-y)] =(x+y+x-y)(x+y-x+y) =2x?2y =4xy. |
经过对同学们试题原文答题和答案批改分析后,可以看出该题目“计算下列各题.(1)(-2xy3z2)4(2)(xy+4)(xy-4)(3)(2x-3)(x-1)(4)(5..”的主要目的是检查您对于考点“初中整式的加减乘除混合运算”相关知识的理解。有关该知识点的概要说明可查看:“初中整式的加减乘除混合运算”。