(1)化简:(8a+2b)-(5a-b)(2)化简求值:12x-2(x-13y2)+(-32x+13y2),其中x=-2,y=23.-数学

题目简介

(1)化简:(8a+2b)-(5a-b)(2)化简求值:12x-2(x-13y2)+(-32x+13y2),其中x=-2,y=23.-数学

题目详情

(1)化简:(8a+2b)-(5a-b)
(2)化简求值:
1
2
x-2(x-
1
3
y2)+(-
3
2
x+
1
3
y2),其中x=-2,y=
2
3
题型:解答题难度:中档来源:不详

答案

(1)原式=8a+2b-5a+b=3a+3b
(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×(-2)+(class="stub"2
3
)
2
=-5class="stub"5
9

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