问题
解答题
(1)计算:
(2)解方程:2x2-3x-2=0. |
答案
(1)
(2 1 2
-2)-(36
-41 3
)0.5
=
-23
-3×2
+4×3 3 2 2
=0;
(2)2x2-3x-2=0,
∴(2x+1)(x-2)=0,
∴x1=-
,x2=2.1 2
(1)计算:
(2)解方程:2x2-3x-2=0. |
(1)
(2 1 2
-2)-(36
-41 3
)0.5
=
-23
-3×2
+4×3 3 2 2
=0;
(2)2x2-3x-2=0,
∴(2x+1)(x-2)=0,
∴x1=-
,x2=2.1 2