题目内容
计算:
(1)|-5|-(π-3)0+(-
)2÷2-1
(2)(-3m+2n)+
(6m-3n-1)
(3)2a(a-1)-(a+1)(a-5)
(4)(-
x2y)3+
x4•(-x)2•(-y)3.
(1)|-5|-(π-3)0+(-
| 1 |
| 2 |
(2)(-3m+2n)+
| 1 |
| 3 |
(3)2a(a-1)-(a+1)(a-5)
(4)(-
| 1 |
| 2 |
| 1 |
| 4 |
(1)原式=5-1+
÷
=5-1+
=4
;
(2)原式=-3m+2n+2m-n-
=-m+n-
;
(3)原式=2a2-2a-a2+5a-a+5
=a2+2a+5;
(4)原式=-
x6y3-
x6y3
=-
x6y3.
| 1 |
| 4 |
| 1 |
| 2 |
=5-1+
| 1 |
| 2 |
=4
| 1 |
| 2 |
(2)原式=-3m+2n+2m-n-
| 1 |
| 3 |
=-m+n-
| 1 |
| 3 |
(3)原式=2a2-2a-a2+5a-a+5
=a2+2a+5;
(4)原式=-
| 1 |
| 8 |
| 1 |
| 4 |
=-
| 3 |
| 8 |
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