问题
解答题
解方程与计算: (1)解方程4x2-7x-2=0; (2)计算:(
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答案
(1) 4x2-7x-2=0,
(x-2)(4x+1)=0,
∴x1=-
,x2=2;1 4
(2)原式=3×
-33 4
-1+32 2
=
-1=9 4
.5 4
解方程与计算: (1)解方程4x2-7x-2=0; (2)计算:(
|
(1) 4x2-7x-2=0,
(x-2)(4x+1)=0,
∴x1=-
,x2=2;1 4
(2)原式=3×
-33 4
-1+32 2
=
-1=9 4
.5 4