题目内容
用简便方法计算,要求写出简算的主要过程.
(
-
)×12÷0.1
×[
÷(
+
)]
5.58-
+5.42-
×40-
÷
.
(
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 8 |
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
5.58-
| 3 |
| 8 |
| 5 |
| 8 |
| 7 |
| 16 |
| 5 |
| 16 |
| 1 |
| 40 |
(1)(
-
)×12÷0.1,
=(
×12-
×12)÷0.1,
=(9-8)÷0.1,
=1÷0.1,
=10;
(2)
×[
÷(
+
)],
=
×[
÷
],
=
×
×
,
=
;
(3)5.58-
+5.42-
,
=(5.58+5.42)-(
+
),
=10-1,
=9;
(4)
×40-
÷
,
=
×40-
×40,
=(
-
)×40,
=
×40,
=5.
| 3 |
| 4 |
| 2 |
| 3 |
=(
| 3 |
| 4 |
| 2 |
| 3 |
=(9-8)÷0.1,
=1÷0.1,
=10;
(2)
| 3 |
| 8 |
| 8 |
| 9 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 8 |
| 8 |
| 9 |
| 19 |
| 12 |
=
| 3 |
| 8 |
| 8 |
| 9 |
| 12 |
| 19 |
=
| 4 |
| 19 |
(3)5.58-
| 3 |
| 8 |
| 5 |
| 8 |
=(5.58+5.42)-(
| 3 |
| 8 |
| 5 |
| 8 |
=10-1,
=9;
(4)
| 7 |
| 16 |
| 5 |
| 16 |
| 1 |
| 40 |
=
| 7 |
| 16 |
| 5 |
| 16 |
=(
| 7 |
| 16 |
| 5 |
| 16 |
=
| 1 |
| 8 |
=5.
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