题目内容
计算:(
-1
-
)÷(-
).
| 7 |
| 9 |
| 1 |
| 6 |
| 7 |
| 18 |
| 1 |
| 36 |
原式=(
-
-
)×(-36)
=
×(-36)-
×(-36)-
×(-36)
=7×(-4)-7×(-6)-7×(-2)
=7×(-4+6+2)
=7×4
=28.
| 7 |
| 9 |
| 7 |
| 6 |
| 7 |
| 18 |
=
| 7 |
| 9 |
| 7 |
| 6 |
| 7 |
| 18 |
=7×(-4)-7×(-6)-7×(-2)
=7×(-4+6+2)
=7×4
=28.
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