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(2012•贵港)(1)计算:|-3|+2-1+12(π-3)0-tan60°;(2)解分式方程:2x+1+4x2−1=1.

题目详情
(2012•贵港)(1)计算:|-
3
|+2-1+
1
2
(π-
3
0-tan60°;
(2)解分式方程:
2
x+1
+
4
x2−1
=1.
3
|+2-1+
1
2
(π-
3
0-tan60°;
(2)解分式方程:
2
x+1
+
4
x2−1
=1.
3
3
3-1
1
2
(π-
3
0-tan60°;
(2)解分式方程:
2
x+1
+
4
x2−1
=1.
1
2
1122
3
0-tan60°;
(2)解分式方程:
2
x+1
+
4
x2−1
=1.
3
3
30
2
x+1
+
4
x2−1
=1.
2
x+1
22x+1x+1
4
x2−1
44x2−1x2−1x2−1x2−12−1
▼优质解答
答案和解析
(1)原式=
3
+
1
2
+
1
2
×1-
3
=1;

(2)方程的两边同乘(x+1)(x-1),得
2(x-1)+4=x2-1,
即x2-2x-3=0,
(x-3)(x+1)=0,
解得x1=3,x2=-1,
检验:把x=3代入(x-1)(x+1)=8≠0,即x=3是原分式方程的解,
把x=-1代入(x+1)(x-1)=0,即x=-1不是原分式方程的解,
则原方程的解为:x=3.
3
3
33+
1
2
+
1
2
×1-
3
=1;

(2)方程的两边同乘(x+1)(x-1),得
2(x-1)+4=x2-1,
即x2-2x-3=0,
(x-3)(x+1)=0,
解得x1=3,x2=-1,
检验:把x=3代入(x-1)(x+1)=8≠0,即x=3是原分式方程的解,
把x=-1代入(x+1)(x-1)=0,即x=-1不是原分式方程的解,
则原方程的解为:x=3.
1
2
111222+
1
2
×1-
3
=1;

(2)方程的两边同乘(x+1)(x-1),得
2(x-1)+4=x2-1,
即x2-2x-3=0,
(x-3)(x+1)=0,
解得x1=3,x2=-1,
检验:把x=3代入(x-1)(x+1)=8≠0,即x=3是原分式方程的解,
把x=-1代入(x+1)(x-1)=0,即x=-1不是原分式方程的解,
则原方程的解为:x=3.
1
2
111222×1-
3
=1;

(2)方程的两边同乘(x+1)(x-1),得
2(x-1)+4=x2-1,
即x2-2x-3=0,
(x-3)(x+1)=0,
解得x1=3,x2=-1,
检验:把x=3代入(x-1)(x+1)=8≠0,即x=3是原分式方程的解,
把x=-1代入(x+1)(x-1)=0,即x=-1不是原分式方程的解,
则原方程的解为:x=3.
3
3
33=1;

(2)方程的两边同乘(x+1)(x-1),得
2(x-1)+4=x22-1,
即x22-2x-3=0,
(x-3)(x+1)=0,
解得x11=3,x22=-1,
检验:把x=3代入(x-1)(x+1)=8≠0,即x=3是原分式方程的解,
把x=-1代入(x+1)(x-1)=0,即x=-1不是原分式方程的解,
则原方程的解为:x=3.