题目内容
计算:
(1)1.25÷(-0.5)÷(-2
)×1
(2)(-81)÷(+3
)×(-
)÷(-1
)
(1)1.25÷(-0.5)÷(-2
| 1 |
| 2 |
(2)(-81)÷(+3
| 1 |
| 4 |
| 4 |
| 9 |
| 1 |
| 13 |
(1)1.25÷(-0.5)÷(-2
)×1
=
÷(-
)÷(-
)×1
=
×(-2)×(-
)×1
=1;
(2)(-81)÷(+3
)×(-
)÷(-1
)
=(-81)÷(+
)×(-
)÷(-
)
=(-81)×
×(-
)×(-
)
=-10
.
| 1 |
| 2 |
=
| 5 |
| 4 |
| 1 |
| 2 |
| 5 |
| 2 |
=
| 5 |
| 4 |
| 2 |
| 5 |
=1;
(2)(-81)÷(+3
| 1 |
| 4 |
| 4 |
| 9 |
| 1 |
| 13 |
=(-81)÷(+
| 13 |
| 4 |
| 4 |
| 9 |
| 14 |
| 13 |
=(-81)×
| 4 |
| 13 |
| 4 |
| 9 |
| 13 |
| 14 |
=-10
| 2 |
| 7 |
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