计算下列各题:(1)-20+(-14)-(-18)-13(2)-32-[22÷(-1)-13]×(-2)÷(-1)2010(3)x2+3x2+x2-3x2(4)
题型:解答题难度:一般来源:不详
计算下列各题: (1)-20+(-14)-(-18)-13 (2)-32-[22÷(-1)-13]×(-2)÷(-1)2010 (3)x2+3x2+x2-3x2 (4)5(a2b-2ab2+c)-4(2c+3a2b-ab2) (5)化简求值:x2+4x-(2x2-x+x2)-(3x-1),其中x=-3. |
答案
(1)-20+(-14)-(-18)-13 =-20+(-14)+18+(-13) =-47+18 =-29;
(2)-32-[22÷(-1)-13]×(-2)÷(-1)2010 =-9-(-4-13)×(-2)÷1 =-9-34 =-43;
(3)x2+3x2+x2-3x2 =(1+3+1-3)x2 =2x2;
(4)5(a2b-2ab2+c)-4(2c+3a2b-ab2) =5a2b-10ab2+5c-8c-12a2b+4ab2 =-7a2b-6ab2-3c;
(5)x2+4x-(2x2-x+x2)-(3x-1) =x2+4x-2x2+x-x2-3x+1 =-2x2+2x+1, 当x=-3时,原式=-18-6+1=-23. |
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