题目内容
计算:
(1)(-
)2÷(-2)0×(-2)-2
(2)19992-2000×1998
(3)(x+3)2-(x-1)(x-2)
(4)(a+4)(a-4)-(a-1)2.
(1)(-
| 1 |
| 2 |
(2)19992-2000×1998
(3)(x+3)2-(x-1)(x-2)
(4)(a+4)(a-4)-(a-1)2.
(1)原式=
×1×
=
;
(2)原式=19992-(1999+1)=19992-19992+1=1;
(3)原式=x2+6x+9-(x2-3x+2)=x2+6x+9-x2+3x-2=9x+7;
(4)原式=a2-16-(a2-2a+1)=a2-16-a2+2a-1=2a-17.
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 16 |
(2)原式=19992-(1999+1)=19992-19992+1=1;
(3)原式=x2+6x+9-(x2-3x+2)=x2+6x+9-x2+3x-2=9x+7;
(4)原式=a2-16-(a2-2a+1)=a2-16-a2+2a-1=2a-17.
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