题目内容
脱式计算,能简便的要用简便方法计算
(1)5120÷32+140
(2)(
-
+
)×30
(3)[1-(
-
)]×
(4)168.1÷(4.3×2-0.4)
(1)5120÷32+140
(2)(
| 1 |
| 3 |
| 1 |
| 6 |
| 4 |
| 5 |
(3)[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
(4)168.1÷(4.3×2-0.4)
(1)5120÷32+140,
=160+140,
=300;
(2)(
-
+
)×30,
=
×30-
×30+
×30,
=10-5+24,
=5+24,
=29;
(3)[1-(
-
)]×
,
=[1-
]×
,
=
×
,
=
;
(4)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.
=160+140,
=300;
(2)(
| 1 |
| 3 |
| 1 |
| 6 |
| 4 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 6 |
| 4 |
| 5 |
=10-5+24,
=5+24,
=29;
(3)[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
=[1-
| 1 |
| 4 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 2 |
(4)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.
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