题目内容
计算:
(1)-17+23+(-16)-(-7)
(2)1-42÷5×(-
)
(3)(-3)2-[(-
)+(-
)]÷
(4)-14÷(-5)2×(-
)+|0.8-1|.
(1)-17+23+(-16)-(-7)
(2)1-42÷5×(-
| 1 |
| 5 |
(3)(-3)2-[(-
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
(4)-14÷(-5)2×(-
| 5 |
| 3 |
(1)原式=[(-17)+(-16)]+(23+7)
=-33+30
=-3;
(2)原式=1-16×
×(-
)
=1+
=
;
(3)原式=9-(-
)×2
=9+
=10
;
(4)原式=-1÷25×(-
)+0.2
=
+
=
.
=-33+30
=-3;
(2)原式=1-16×
| 1 |
| 5 |
| 1 |
| 5 |
=1+
| 16 |
| 25 |
=
| 41 |
| 25 |
(3)原式=9-(-
| 11 |
| 12 |
=9+
| 11 |
| 6 |
=10
| 1 |
| 6 |
(4)原式=-1÷25×(-
| 5 |
| 3 |
=
| 1 |
| 15 |
| 1 |
| 5 |
=
| 4 |
| 15 |
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