问题
解答题
解方程 (1)(x+3)2=(1-2x)2 (2)3x(x-1)=2-2x (3)(
(4)4sin30°+2
|
答案
(1)∵x+3=±(1-2x),
∴x1=-
,x2=-4;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+
×1|+23
=3-(2-
)+23
=3-2+
+23
=3+
;3
(4)原式=4×
+21 2
×3
+13 2
=2+3+1
=6.