题目内容
解方程
(1)(x+3)2=(1-2x)2
(2)3x(x-1)=2-2x
(3)(
)-1-|-2+
tan45°|+(
-1.41)0
(4)4sin30°+2
cos30°+tan45°.
(1)(x+3)2=(1-2x)2
(2)3x(x-1)=2-2x
(3)(
| 1 |
| 3 |
| 3 |
| 2 |
(4)4sin30°+2
| 3 |
(1)∵x+3=±(1-2x),
∴x1=-
,x2=-4;
(2)∵3x(x-1)+2(x-1)=0,
∴(x-1)(3x+2)=0,
∴x-1=0或3x+2=0,
∴x1=1,x2=-
.
(3)原式=3-|-2+
×1|+2
=3-(2-
)+2
=3-2+
+2
=3+
;
(4)原式=4×
+2
×
+1
=2+3+1
=6.
∴x1=-
| 2 |
| 3 |
(2)∵3x(x-1)+2(x-1)=0,
∴(x-1)(3x+2)=0,
∴x-1=0或3x+2=0,
∴x1=1,x2=-
| 2 |
| 3 |
(3)原式=3-|-2+
| 3 |
=3-(2-
| 3 |
=3-2+
| 3 |
=3+
| 3 |
(4)原式=4×
| 1 |
| 2 |
| 3 |
| ||
| 2 |
=2+3+1
=6.
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