题目内容
脱式计算.
①(
-
)×(1-
)
②
×
+
÷
③[1-(
+
)]×
÷2
④(
+3.9+
+16.1)÷
.
①(
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 7 |
②
| 5 |
| 7 |
| 21 |
| 12 |
| 1 |
| 5 |
| 4 |
| 5 |
③[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
④(
| 15 |
| 11 |
| 7 |
| 11 |
| 5 |
| 6 |
①(
-
)×(1-
),
=
×
,
=
;
②
×
+
÷
,
=
+
×
,
=
+
,
=
;
③[1-(
+
)]×
÷2,
=[1-
]×
÷2,
=
×
÷2,
=
÷2,
=
;
④(
+3.9+
+16.1)÷
,
=[(
+
)+(3.9+16.1)]÷
,
=[2+20]÷
,
=22÷
,
=
.
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 7 |
=
| 7 |
| 20 |
| 4 |
| 7 |
=
| 1 |
| 5 |
②
| 5 |
| 7 |
| 21 |
| 12 |
| 1 |
| 5 |
| 4 |
| 5 |
=
| 5 |
| 4 |
| 1 |
| 5 |
| 5 |
| 4 |
=
| 5 |
| 4 |
| 1 |
| 4 |
=
| 3 |
| 2 |
③[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
=[1-
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 6 |
=
| 1 |
| 12 |
④(
| 15 |
| 11 |
| 7 |
| 11 |
| 5 |
| 6 |
=[(
| 15 |
| 11 |
| 7 |
| 11 |
| 5 |
| 6 |
=[2+20]÷
| 5 |
| 6 |
=22÷
| 5 |
| 6 |
=
| 132 |
| 5 |
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