题目内容
计算下列各题:
(1)1-2+3=______;
(2)-2×(-7)=______;
(3)(-1)2-|-5|=______;
(4)10÷(-5)=______;
(5)2÷(-
)=______;
(6)(-3)2-3÷
=______;
(7)(-2)3-32=______;
(8)2a-5-3a+1=______.
(1)1-2+3=______;
(2)-2×(-7)=______;
(3)(-1)2-|-5|=______;
(4)10÷(-5)=______;
(5)2÷(-
| 1 |
| 6 |
(6)(-3)2-3÷
| 1 |
| 2 |
(7)(-2)3-32=______;
(8)2a-5-3a+1=______.
(1)1-2+3=(1+3)-2=4-2=2;
故答案为:2;
(2)-2×(-7)=14;
故答案为:14;
(3)(-1)2-|-5|=1-5=-4;
故答案为:-4;
(4)10÷(-5)=-2;
故答案为:-2;
(5)2÷(-
)=2×(-6)=-12;
故答案为:-12;
(6)(-3)2-3÷
=9-6=3;
故答案为:3;
(7)(-2)3-32=-8-9=-17;
故答案为:-17;
(8)2a-5-3a+1=2a-3a-5+1=-a-4.
故答案为:-a-4.
故答案为:2;
(2)-2×(-7)=14;
故答案为:14;
(3)(-1)2-|-5|=1-5=-4;
故答案为:-4;
(4)10÷(-5)=-2;
故答案为:-2;
(5)2÷(-
| 1 |
| 6 |
故答案为:-12;
(6)(-3)2-3÷
| 1 |
| 2 |
故答案为:3;
(7)(-2)3-32=-8-9=-17;
故答案为:-17;
(8)2a-5-3a+1=2a-3a-5+1=-a-4.
故答案为:-a-4.
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