问题
解答题
化简: (1)(5a2+2a-1)-4(3-8a+2a2) (2)3x2-[5x-(
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答案
(1)原式=5a2+2a-1-12+32a-8a2=-3a2+34a-13;
(2)原式=3x2-(5x-
x+3+2x2)=3x2-5x+1 2
x-3-2x2=x2-1 2
x-3.9 2
化简: (1)(5a2+2a-1)-4(3-8a+2a2) (2)3x2-[5x-(
|
(1)原式=5a2+2a-1-12+32a-8a2=-3a2+34a-13;
(2)原式=3x2-(5x-
x+3+2x2)=3x2-5x+1 2
x-3-2x2=x2-1 2
x-3.9 2