题目内容
计算下面各题,能算简算的要简算.
(
|
|
|
(1)(
+80)×125,
=
×125+80×125,
=50+10000,
=10050;
(2)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)
×(
-
)×
,
=
×
×
,
=
×(
×
),
=
×
,
=
.
| 2 |
| 5 |
=
| 2 |
| 5 |
=50+10000,
=10050;
(2)
| 7 |
| 8 |
| 15 |
| 13 |
| 1 |
| 8 |
| 13 |
| 15 |
=
| 7 |
| 8 |
| 13 |
| 15 |
| 1 |
| 8 |
| 13 |
| 15 |
=(
| 7 |
| 8 |
| 1 |
| 8 |
| 13 |
| 15 |
=1×
| 13 |
| 15 |
=
| 13 |
| 15 |
(3)
| 3 |
| 8 |
| 2 |
| 3 |
| 1 |
| 5 |
| 3 |
| 14 |
=
| 3 |
| 8 |
| 7 |
| 15 |
| 3 |
| 14 |
=
| 3 |
| 8 |
| 7 |
| 15 |
| 3 |
| 14 |
=
| 3 |
| 8 |
| 1 |
| 10 |
=
| 3 |
| 80 |
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