题目内容
计算(能简算的要简算).
(15+
|
| 13×
| ||||||||||||||
87×
|
|
|
(1)(15+
)×
,
=15×
+
×
,
=2+
,
=2
;
(2)
-
×
,
=
×(1-
),
=
×
,
=
;
(3)13×
+
×15,
=
×(13+15),
=
×28,
=6;
(4)87×
,
=86×
+1×
,
=3+
,
=3
;
(5)
×
×32,
=(
×4)×(
×8),
=5×1,
=5;
(6)
+
×
,
=
+
,
=3
.
| 5 |
| 7 |
| 2 |
| 15 |
=15×
| 2 |
| 15 |
| 5 |
| 7 |
| 2 |
| 15 |
=2+
| 2 |
| 21 |
=2
| 2 |
| 21 |
(2)
| 2 |
| 9 |
| 7 |
| 16 |
| 2 |
| 9 |
=
| 2 |
| 9 |
| 7 |
| 16 |
=
| 2 |
| 9 |
| 8 |
| 16 |
=
| 1 |
| 9 |
(3)13×
| 3 |
| 14 |
| 3 |
| 14 |
=
| 3 |
| 14 |
=
| 3 |
| 14 |
=6;
(4)87×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
(5)
| 5 |
| 4 |
| 1 |
| 8 |
=(
| 5 |
| 4 |
| 1 |
| 8 |
=5×1,
=5;
(6)
| 7 |
| 3 |
| 2 |
| 3 |
| 6 |
| 5 |
=
| 7 |
| 3 |
| 4 |
| 5 |
=3
| 2 |
| 15 |
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