(1)计算:-2-2+|1-1sin45°|×(8+2);(2)解方程:xx-1-1=3x2+x-2.-数学

题目简介

(1)计算:-2-2+|1-1sin45°|×(8+2);(2)解方程:xx-1-1=3x2+x-2.-数学

题目详情

(1)计算:-2-2+|1-
1
sin45°
|×(
8
+2)

(2)解方程:
x
x-1
-1=
3
x2+x-2
题型:解答题难度:中档来源:绵阳

答案

(1)原式=-class="stub"1
4
+2(
2
-1)×(
2
+1)
=-class="stub"1
4
+2
=1class="stub"3
4


(2)去分母得:x(x+2)-(x-1)(x+2)=3,
去括号得:x2+2x-x2-x+2=3,
解得:x=1,
经检验x=1是增根,原分式方程无解.

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