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试题原文 |
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(1)(2x-y+z-2c+m)(m+y-2x-2c-z), =[(m-2c)+(2x-y+z)]?[(m-2c)-(2x-y+z)], =(m-2c)2-(2x-y+z)2, =m2-4cm+4c2-(4x2+y2+z2-4xy+4xz-2yz), =m2-4cm+4c2-4x2-y2-z2+4xy-4xz+2yz; (2)(a+3b)(a2-3ab+9b2)-(a-3b)(a2+3ab+9b2), =(a3+27b3)-(a3-27b3), =54b3; (3)(x+y)2(y+z-x)(z+x-y)+(x-y)2(x+y+z)(x+y-z), =(x+y)2[z-(x-y)][z+(x-y)]+(x-y)2[(x+y)+z]×[(x+y)-z], =(x+y)2[z2-(x-y)2]+(x-y)2[(x+y)2-z2], =(x+y)2z2-(x-y)2z2, =4xyz2. |
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“化简:(1)(2x-y+z-2c+m)(m+y-2x-2c-z);(2)(a+3b)(a2-3ab+9b2)-(a..”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”。