题目内容
-7+13-6+20=______;
÷(-2
)=______-64÷3
×
=______.
| 3 |
| 7 |
| 1 |
| 7 |
| 1 |
| 5 |
| 5 |
| 8 |
①-7+13-6+20
=(-7-6)+(13+20)
=-13+33
=20;
②
÷(-2
)
=
×(-
)
=-
;
③-64÷3
×
=-64×
×
=-
.
=(-7-6)+(13+20)
=-13+33
=20;
②
| 3 |
| 7 |
| 1 |
| 7 |
=
| 3 |
| 7 |
| 7 |
| 15 |
=-
| 1 |
| 5 |
③-64÷3
| 1 |
| 5 |
| 5 |
| 8 |
=-64×
| 5 |
| 16 |
| 5 |
| 8 |
=-
| 25 |
| 2 |
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