题目内容
计算:(-5)×13
-9×(-13
)+4×(-13
)+(1
+2
-3
)×(-24).
| 7 |
| 12 |
| 7 |
| 12 |
| 7 |
| 12 |
| 3 |
| 8 |
| 1 |
| 3 |
| 3 |
| 4 |
原式=-5×13
+9×13
-4×13
+(
+
-
)×(-24)
=13
(-5+9-4)-
×24-
×24+
×24
=0-33-56+90
=1.
| 7 |
| 12 |
| 7 |
| 12 |
| 7 |
| 12 |
| 11 |
| 8 |
| 7 |
| 3 |
| 15 |
| 4 |
=13
| 7 |
| 12 |
| 11 |
| 8 |
| 7 |
| 3 |
| 15 |
| 4 |
=0-33-56+90
=1.
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