问题
解答题
(1)计算:|
(2)计算:
(3)计算(
(4)解方程:2x2-7x+6=0 |
答案
(1)原式=4-
-4+23
,3
=
;3
(2)原式=
×32 3
+6×x
-2x 2
,x
=2
+3x
-2x
,x
=3
;x
(3)原式=2×1+
-2
=2;2
(4)(2x-3)(x-2)=0,
∴2x-3=0,x-2=0,
解得x1=
,x2=2.3 2
(1)计算:|
(2)计算:
(3)计算(
(4)解方程:2x2-7x+6=0 |
(1)原式=4-
-4+23
,3
=
;3
(2)原式=
×32 3
+6×x
-2x 2
,x
=2
+3x
-2x
,x
=3
;x
(3)原式=2×1+
-2
=2;2
(4)(2x-3)(x-2)=0,
∴2x-3=0,x-2=0,
解得x1=
,x2=2.3 2