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> (1)解方程:2x2-3x-2=0(2)计算:(12-418)-(313-20.5)-数学
(1)解方程:2x2-3x-2=0(2)计算:(12-418)-(313-20.5)-数学
题目简介
(1)解方程:2x2-3x-2=0(2)计算:(12-418)-(313-20.5)-数学
题目详情
(1)解方程:2x
2
-3x-2=0
(2)计算:(
12
-4
1
8
)-(3
1
3
-2
0.5
)
题型:解答题
难度:中档
来源:不详
答案
(1)2x2-3x-2=0,
(x-2)(2x+1)=0,
x-2=0或2x+1=0,
解得:x1=2,x2=-
class="stub"1
2
;
(2)原式=(2
3
-4×
2
4
)-(3×
3
3
-2×
2
2
)
=2
3
-
2
-
3
+
2
=
3
.
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题目简介
(1)解方程:2x2-3x-2=0(2)计算:(12-418)-(313-20.5)-数学
题目详情
(2)计算:(
答案
(x-2)(2x+1)=0,
x-2=0或2x+1=0,
解得:x1=2,x2=-
(2)原式=(2
=2
=