题目内容
脱式计算,能简算的要简算.
(1)3.6-2.8+7.4-7.2;
(2)
×101-
;
(3)(5÷
-
÷5)÷
;
(4)
×7.7+3.3×0.8-80%.
(1)3.6-2.8+7.4-7.2;
(2)
| 37 |
| 100 |
| 37 |
| 100 |
(3)(5÷
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 18 |
(4)
| 4 |
| 5 |
(1)3.6-2.8+7.4-7.2
=(3.6+7.4)-(2.8+7.2)
=11-10
=1
(2)
×101-
=
×(101-1)
=
×100
=37
(3)(5÷
-
÷5)÷
=(6-
)×
=
×
=21
(4)
×7.7+3.3×0.8-80%
=0.8×(7.7+3.3-1)
=0.8×10
=8
=(3.6+7.4)-(2.8+7.2)
=11-10
=1
(2)
| 37 |
| 100 |
| 37 |
| 100 |
=
| 37 |
| 100 |
=
| 37 |
| 100 |
=37
(3)(5÷
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 18 |
=(6-
| 1 |
| 6 |
| 18 |
| 5 |
=
| 35 |
| 6 |
| 18 |
| 5 |
=21
(4)
| 4 |
| 5 |
=0.8×(7.7+3.3-1)
=0.8×10
=8
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