计算或化简:(1)计算:4+(13)-1-(10-5)0-2tan45°(2)化简右边的式子:(2a-1+a-2a2-1)÷aa+1.-数学

题目简介

计算或化简:(1)计算:4+(13)-1-(10-5)0-2tan45°(2)化简右边的式子:(2a-1+a-2a2-1)÷aa+1.-数学

题目详情

计算或化简:
(1)计算:
4
+(
1
3
)-1-(
10
-
5
)0-2tan45°

(2)化简右边的式子:(
2
a-1
+
a-2
a2-1
a
a+1
题型:解答题难度:中档来源:镇江二模

答案

(1)原式=2+3-1-2
=2;

(2)原式=【
2(a+1)
(a+1)(a-1)
+class="stub"a-2
(a+1)(a-1)
]•class="stub"a+1
a

=class="stub"2a+2+a-2
(a+1)(a-1)
×class="stub"a+1
a

=class="stub"3
a-1

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