题目内容
(1)计算:(-1)2÷
+(7-3)×
-(
)0;
(2)计算:[(2x-y)(2x+y)+y(y-6x)]÷2x;
(3)解方程:x2-6x+1=0.
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 2 |
(2)计算:[(2x-y)(2x+y)+y(y-6x)]÷2x;
(3)解方程:x2-6x+1=0.
(1)原式=(-1)2÷
+(7-3)×
-(
)0
=1×2+4×
-1
=2+3-1
=4;
(2)原式=[(2x-y)(2x+y)+y(y-6x)]÷2x
=(4x2-y2+y2-6xy)÷2x
=(4x2-6xy)÷2x
=2x-3y;
(3)x2-6x+1=0
(x-3)2-8=0
(x-3)2=8
x-3=±2
即x1=3+2
,x2=3-2
.
| 1 |
| 2 |
| 3 |
| 4 |
| 1 |
| 2 |
=1×2+4×
| 3 |
| 4 |
=2+3-1
=4;
(2)原式=[(2x-y)(2x+y)+y(y-6x)]÷2x
=(4x2-y2+y2-6xy)÷2x
=(4x2-6xy)÷2x
=2x-3y;
(3)x2-6x+1=0
(x-3)2-8=0
(x-3)2=8
x-3=±2
| 2 |
即x1=3+2
| 2 |
| 2 |
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