(1)计算:(-1)2011-(3-2)0+(12)-1;(2)计算:(x2x+4-16x+4)÷x-4x;(3)计算:2mm2-9-1m+3.-数学

题目简介

(1)计算:(-1)2011-(3-2)0+(12)-1;(2)计算:(x2x+4-16x+4)÷x-4x;(3)计算:2mm2-9-1m+3.-数学

题目详情

(1)计算:(-1)2011-(
3
-
2
)0+(
1
2
)-1

(2)计算:(
x2
x+4
-
16
x+4
x-4
x

(3)计算:
2m
m2-9
-
1
m+3
题型:解答题难度:中档来源:不详

答案

(1)原式=-1-1+2=0;
(2)原式=(x-4)class="stub"x
x-4
=x;
(3)原式=class="stub"2m
(m+3)(m-3)
-class="stub"m-3
(m+3)(m-3)
=
2m-(m-3)
(m+3)(m-3)
=class="stub"1
m-3

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