题目内容
计算与解方程:
(1)
-
+(
)2
(2)
÷3
×
(3)
+
-(
-1)0+(-2)-2-3
(4)3x(x-1)=x-1
(5)x2+4x+3=0
(6)2x2-x-2=0.
(1)
6 | ||
|
18 |
2 |
(2)
3a2 |
|
1 |
2 |
|
(3)
2 | ||
|
27 |
3 |
|
(4)3x(x-1)=x-1
(5)x2+4x+3=0
(6)2x2-x-2=0.
(1)原式=3
-3
+2
=2;
(2)原式=
=
a;
(3)原式=
+1+3
-1+
-3×
=3
+
;
(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=
,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=
,
则x1=
,x2=
.
2 |
2 |
=2;
(2)原式=
3a2÷
|
=
1 |
3 |
(3)原式=
3 |
3 |
1 |
4 |
| ||
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 |
(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=
1±
| ||
4 |
则x1=
1+
| ||
4 |
1-
| ||
4 |
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