问题 解答题
计算与解方程:
(1)
6
2
-
18
+(
2
)2

(2)
3a2
÷3
a
2
×
1
2
2a
3

(3)
2
3
-1
+
27
-(
3
-1)0+(-2)-2-3
1
3

(4)3x(x-1)=x-1
(5)x2+4x+3=0
(6)2x2-x-2=0.
答案

(1)原式=3

2
-3
2
+2

=2;

(2)原式=

3a2÷
9a
2
×
a
6

=

1
3
a;

(3)原式=

3
+1+3
3
-1+
1
4
-3×
3
3

=3

3
+
1
4

(4)方程整理得:3x(x-1)-(x-1)=0,

分解因式得:(3x-1)(x-1)=0,

可得3x-1=0或x-1=0,

解得:x1=

1
3
,x2=1;

(5)分解因式得:(x+1)(x+3)=0,

可得x+1=0或x+3=0,

解得:x1=-1,x2=-3;

(6)这里a=2,b=-1,c=-2,

∵△=1+16=17,

∴x=

17
4

则x1=

1+
17
4
,x2=
1-
17
4

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