题目内容
计算或化简下列各题
①-16+23+(-17)-(-7)
②(-1)2012×3+4÷(-2)3
③|-
|÷(
-
)-
×(-4)2
④-22÷
-[22-(1-
×
)]×12
⑤(4a2-3a+1)-3(-a2+2a)
⑥3x2-(4xy-5y2)-2(x2-3yx+2y2)
①-16+23+(-17)-(-7)
②(-1)2012×3+4÷(-2)3
③|-
7 |
9 |
2 |
3 |
1 |
5 |
1 |
3 |
④-22÷
4 |
3 |
1 |
2 |
1 |
3 |
⑤(4a2-3a+1)-3(-a2+2a)
⑥3x2-(4xy-5y2)-2(x2-3yx+2y2)
①原式=-16+23-17+7
=-33+30
=-3;
②原式=1×3+4÷(-8)
=3-
=2
;
③原式=
÷
-
×16
=
-
=-
;
④原式=-4×
-(4-
)×12
=-3-48+10
=-43;
⑤原式=4a2-3a+1+3a2-6a
=a2-9a+1;
⑥原式=3x2-4xy+5y2-2x2+6yx-4y2
=x2+2xy+y2.
=-33+30
=-3;
②原式=1×3+4÷(-8)
=3-
1 |
2 |
=2
1 |
2 |
③原式=
7 |
9 |
7 |
15 |
1 |
3 |
=
5 |
3 |
16 |
3 |
=-
11 |
3 |
④原式=-4×
3 |
4 |
5 |
6 |
=-3-48+10
=-43;
⑤原式=4a2-3a+1+3a2-6a
=a2-9a+1;
⑥原式=3x2-4xy+5y2-2x2+6yx-4y2
=x2+2xy+y2.
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