题目内容
计算:
(1)(
| (2)
|
(1)(
-
)÷
×5,
=(
-
)×
×5,
=
×
×5-
×
×5,
=15-14,
=1;
(2)
×7.7+3.3×0.8-80%,
=0.8×7.7+3.3×0.8-80%,
=0.8×(7.7+3.3-1),
=0.8×10,
=8.
| 5 |
| 7 |
| 2 |
| 3 |
| 5 |
| 21 |
=(
| 5 |
| 7 |
| 2 |
| 3 |
| 21 |
| 5 |
=
| 5 |
| 7 |
| 21 |
| 5 |
| 2 |
| 3 |
| 21 |
| 5 |
=15-14,
=1;
(2)
| 4 |
| 5 |
=0.8×7.7+3.3×0.8-80%,
=0.8×(7.7+3.3-1),
=0.8×10,
=8.
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