题目内容
计算下列各题,能简算的要简算.
|
7÷
| ||||||||||||
48×(
|
|
(1)
×99+
,
=
×(99+1),
=
×100,
=12;
(2)7÷
+9×
,
=7×
+9×
,
=(7+9)×
,
=16×
,
=20;
(3)48×(
+
),
=48×
+48×
,
=28+12,
=40;
(4)
×
÷
×
,
=
×
×
×
,
=(
×
)×(
×
),
=1×
,
=
.
| 3 |
| 25 |
| 3 |
| 25 |
=
| 3 |
| 25 |
=
| 3 |
| 25 |
=12;
(2)7÷
| 4 |
| 5 |
| 5 |
| 4 |
=7×
| 5 |
| 4 |
| 5 |
| 4 |
=(7+9)×
| 5 |
| 4 |
=16×
| 5 |
| 4 |
=20;
(3)48×(
| 7 |
| 12 |
| 1 |
| 4 |
=48×
| 7 |
| 12 |
| 1 |
| 4 |
=28+12,
=40;
(4)
| 5 |
| 11 |
| 1 |
| 4 |
| 5 |
| 11 |
| 1 |
| 4 |
=
| 5 |
| 11 |
| 1 |
| 4 |
| 11 |
| 5 |
| 1 |
| 4 |
=(
| 5 |
| 11 |
| 11 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
=1×
| 1 |
| 16 |
=
| 1 |
| 16 |
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