题目内容
| 计算下列各题.(能简算的要简算) 7÷
| 15÷
|
| ||||||||||||||||||
3-
|
|
|
(1)7÷
-
÷7
=7×
-
×
,
=9-
,
=8
;
(2)15÷
+15×
=15×
+15×
,
=15×(
+
),
=15×2,
=30;
(3)
÷[
÷(
-
)]
=
÷[
÷
],
=
÷[
×
],
=
÷
,
=
×
,
=
;
(4)3-
×
-
=3-
-
,
=3-(
+
),
=3-1,
=2;
(5)
×9+
=7+
,
=7
;
(6)
÷
-
×
=
×
-
×
,
=(
-
)×
,
=1×
,
=
.
| 7 |
| 9 |
| 7 |
| 9 |
=7×
| 9 |
| 7 |
| 7 |
| 9 |
| 1 |
| 7 |
=9-
| 1 |
| 9 |
=8
| 8 |
| 9 |
(2)15÷
| 8 |
| 9 |
| 7 |
| 8 |
=15×
| 9 |
| 8 |
| 7 |
| 8 |
=15×(
| 9 |
| 8 |
| 7 |
| 8 |
=15×2,
=30;
(3)
| 3 |
| 22 |
| 5 |
| 4 |
| 14 |
| 3 |
| 1 |
| 2 |
=
| 3 |
| 22 |
| 5 |
| 4 |
| 25 |
| 6 |
=
| 3 |
| 22 |
| 5 |
| 4 |
| 6 |
| 25 |
=
| 3 |
| 22 |
| 3 |
| 10 |
=
| 3 |
| 22 |
| 10 |
| 3 |
=
| 5 |
| 11 |
(4)3-
| 5 |
| 18 |
| 27 |
| 40 |
| 13 |
| 16 |
=3-
| 3 |
| 16 |
| 13 |
| 16 |
=3-(
| 3 |
| 16 |
| 13 |
| 16 |
=3-1,
=2;
(5)
| 7 |
| 9 |
| 7 |
| 9 |
=7+
| 7 |
| 9 |
=7
| 7 |
| 9 |
(6)
| 19 |
| 13 |
| 7 |
| 5 |
| 6 |
| 13 |
| 5 |
| 7 |
=
| 19 |
| 13 |
| 5 |
| 7 |
| 6 |
| 13 |
| 5 |
| 7 |
=(
| 19 |
| 13 |
| 6 |
| 13 |
| 5 |
| 7 |
=1×
| 5 |
| 7 |
=
| 5 |
| 7 |
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