问题
解答题
(1)计算
(2)解方程:3x2-2x-1=0. |
答案
(1)原式=
-48÷3
+2
×121 2
=4-6
+26
=4+6
;6
(2)3x2-2x-1=0,
分解因式得:(3x+1)(x-1)=0,
可得3x+1=0或x-1=0,
解得:x1=-
,x2=1.1 3
(1)计算
(2)解方程:3x2-2x-1=0. |
(1)原式=
-48÷3
+2
×121 2
=4-6
+26
=4+6
;6
(2)3x2-2x-1=0,
分解因式得:(3x+1)(x-1)=0,
可得3x+1=0或x-1=0,
解得:x1=-
,x2=1.1 3