计算:(1)(-3a3)2-a3+(-4a)2-a7+(-5a3)3;(2)30-23+(-3)2-(12)-1;(3)5x(x2+2x+1)-(2x+3)(x
题型:解答题难度:一般来源:不详
计算: (1)(-3a3)2-a3+(-4a)2-a7+(-5a3)3; (2)30-23+(-3)2-()-1; (3)5x(x2+2x+1)-(2x+3)(x-5); (4)(2x-3y)(-2x-3y)+(x-4y)2. |
答案
(1)原式=9a9+16a9-125a9=-100a9;
(2)原式=1-8+9-2=0;
(3)原式=5x3+10x2+5x-(2x2-7x-15)=5x3+8x2+12x+15;
(4)原式=9y2-4x2+x2-8xy+16y2=25y2-8xy-3x2. |
举一反三
解答下列各题 (1)计算:-22+(-)-1-(-1)0+; (2)化简:(x-3)(x+3)-(x-3)2. |
(1)计算:(1-)0+(-3)-1+(-1)2011()2012; (2)先化简,再求值:[(2xy+3)(2xy-3)+(xy+3)2]÷xy,其中x=,y=-2. |
计算: (1)(-1)2009+(-)-2-(π-1)0-|-3|; (2)(-3a3)2-a3+(-4a)2-a7+(-5a3)3 (3)(x+3)2-(x-1)(x-2) (4)(a-2b+c)(a+2b+c) |
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