计算:(1)x2•xn+1-xn-2x4+xn-1•x4.(2)(x+y)2•(x+y)•(x+y)2+(x+y)2•(x+y)3.
题型:解答题难度:一般来源:不详
计算: (1)x2•xn+1-xn-2x4+xn-1•x4. (2)(x+y)2•(x+y)•(x+y)2+(x+y)2•(x+y)3. |
答案
(1)原式=xn+3-xn+2+xn+3=2xn+3-xn+2;
(2)原式=(x+y)5+(x+y)5=2(x+y)5. |
举一反三
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