计算:(1)3x2+1+2x-5+3x-2x2(2)12x-2(x-13y2)+(-32x+13y2)(3)3x2-[7x-(4x-3)-2x2].-数学

题目简介

计算:(1)3x2+1+2x-5+3x-2x2(2)12x-2(x-13y2)+(-32x+13y2)(3)3x2-[7x-(4x-3)-2x2].-数学

题目详情

计算:
(1)3x2+1+2x-5+3x-2x2
(2)
1
2
x-2(x-
1
3
y2)+(-
3
2
x+
1
3
y2)

(3)3x2-[7x-(4x-3)-2x2].
题型:解答题难度:中档来源:不详

答案

(1)原式=x2+5x-4;

(2)原式=class="stub"1
2
x-2x+class="stub"2
3
y2-class="stub"3
2
x+class="stub"1
3
y2
=-3x+y2;

(3)原式=3x2-7x+4x-3+2x2
=5x2-3x-3.

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