题目内容
计算下面各题.
×
×8
(
×
)×
(
+
)×42.
| 3 |
| 8 |
| 1 |
| 9 |
(
| 15 |
| 9 |
| 4 |
| 17 |
| 17 |
| 12 |
(
| 5 |
| 6 |
| 4 |
| 7 |
(1)
×
×8,
=
×8×
,
=3×
,
=
;
(2)(
×
)×
,
=
×(
×
),
=
×
,
=
;
(3)(
+
)×42,
=
×42+
×42,
=35+24,
=59.
| 3 |
| 8 |
| 1 |
| 9 |
=
| 3 |
| 8 |
| 1 |
| 9 |
=3×
| 1 |
| 9 |
=
| 1 |
| 3 |
(2)(
| 15 |
| 9 |
| 4 |
| 17 |
| 17 |
| 12 |
=
| 15 |
| 9 |
| 4 |
| 17 |
| 17 |
| 12 |
=
| 5 |
| 3 |
| 1 |
| 3 |
=
| 5 |
| 9 |
(3)(
| 5 |
| 6 |
| 4 |
| 7 |
=
| 5 |
| 6 |
| 4 |
| 7 |
=35+24,
=59.
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