计算(1)3a+4b-5a-b; (2)-3(1-x)-(1-x-x2)+(1-x+x2-x3)
题型:解答题难度:一般来源:不详
计算 (1)3a+4b-5a-b; (2)-3(1-x)-(1-x-x2)+(1-x+x2-x3) |
答案
(1)原式=3a-5a+4b-b=-2a+3b; (2)原式=-3+3x-1+x+x2+1-x+x2-x3=-x3+x2+x2+3x+x-x-3+1-1=-x3+2x2+3x-3. |
举一反三
化简 (1)5x2-6+3x-2x2-3x+2 (2)3(2a-5)-2(a-3) |
化简后求值:(5a2-2b2+a2+2ab)-(+5a2-b2+2ab-3b2),其中a=2,b=3. |
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