题目内容
计算:
(1)(+26)+(-18)+5-16
(2)(-81)÷
×
÷(-16)
(3)7+5×(-2)-(-3)3÷9
(4)-12×(
+
-
).
(1)(+26)+(-18)+5-16
(2)(-81)÷
| 9 |
| 4 |
| 4 |
| 9 |
(3)7+5×(-2)-(-3)3÷9
(4)-12×(
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 6 |
(1)(+26)+(-18)+5-16
=26-18+5-16
=31-34
=-3;
(2)(-81)÷
×
÷(-16)
=(-81)×
×
×(-
)
=1;
(3)7+5×(-2)-(-3)3÷9
=7+(-10)-(-27)÷9
=-3-(-3)
=0;
(4)-12×(
+
-
)
=-(12×
+12×
-12×
)
=-(8+3-10)
=-1.
=26-18+5-16
=31-34
=-3;
(2)(-81)÷
| 9 |
| 4 |
| 4 |
| 9 |
=(-81)×
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 16 |
=1;
(3)7+5×(-2)-(-3)3÷9
=7+(-10)-(-27)÷9
=-3-(-3)
=0;
(4)-12×(
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 6 |
=-(12×
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 6 |
=-(8+3-10)
=-1.
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