题目内容
计算
21÷(
+
)÷
2.23×
+2.77÷2.5
÷[
×(
-
)].
21÷(
| 1 |
| 3 |
| 2 |
| 5 |
| 9 |
| 11 |
2.23×
| 2 |
| 5 |
| 7 |
| 8 |
| 1 |
| 3 |
| 3 |
| 2 |
| 3 |
| 4 |
(1)21÷(
+
)÷
,
=21÷
÷
,
=
÷
,
=35;
(2)2.23×
+2.77÷2.5,
=0.892+1.108,
=2;
(3)
÷[
×(
-
)],
=
÷[
×
],
=
÷
,
=3
.
| 1 |
| 3 |
| 2 |
| 5 |
| 9 |
| 11 |
=21÷
| 11 |
| 15 |
| 9 |
| 11 |
=
| 315 |
| 11 |
| 9 |
| 11 |
=35;
(2)2.23×
| 2 |
| 5 |
=0.892+1.108,
=2;
(3)
| 7 |
| 8 |
| 1 |
| 3 |
| 3 |
| 2 |
| 3 |
| 4 |
=
| 7 |
| 8 |
| 1 |
| 3 |
| 3 |
| 4 |
=
| 7 |
| 8 |
| 1 |
| 4 |
=3
| 1 |
| 2 |
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