题目内容
用你喜欢的方法计算.
×
÷
(
+
)÷
-
×
×21+
÷
.
| 3 |
| 4 |
| 5 |
| 4 |
| 15 |
| 4 |
(
| 5 |
| 6 |
| 11 |
| 12 |
| 11 |
| 12 |
| 5 |
| 8 |
| 1 |
| 3 |
| 9 |
| 8 |
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 21 |
(1)
×
÷
,
=
×
×
,
=
;
(2)(
+
)÷
,
=(
+
)×
,
=
×
+
×
,
=
+1,
=1
;
(3)
-
×
,
=
-
,
=
;
(4)
×21+
÷
,
=(
+
)×21,
=1×21,
=21.
| 3 |
| 4 |
| 5 |
| 4 |
| 15 |
| 4 |
=
| 3 |
| 4 |
| 5 |
| 4 |
| 4 |
| 15 |
=
| 1 |
| 4 |
(2)(
| 5 |
| 6 |
| 11 |
| 12 |
| 11 |
| 12 |
=(
| 5 |
| 6 |
| 11 |
| 12 |
| 12 |
| 11 |
=
| 5 |
| 6 |
| 12 |
| 11 |
| 11 |
| 12 |
| 12 |
| 11 |
=
| 10 |
| 11 |
=1
| 10 |
| 11 |
(3)
| 5 |
| 8 |
| 1 |
| 3 |
| 9 |
| 8 |
=
| 5 |
| 8 |
| 3 |
| 8 |
=
| 1 |
| 4 |
(4)
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 21 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
=1×21,
=21.
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