题目内容
(15+
|
|
| ||||||||||||||
42×(
| 24×(
|
|
(1)(15+
)×
=15×
+
×
=9+
=9
;
(2)
×8+
×8
=
×(7+1)×2
=(
×7+
×1)×2
=3×2+
×2
=6+
=6
;
(3)
×11+
=
×(11+1)
=
×12
=10;
(4)42×(
+
)
=42×
+
×42
=7+6
=13;
(5)24×(
-
)
=24×
-
×24
=20-14
=6;
(6)
×
×
=
×
×
=
×
=
.
| 5 |
| 9 |
| 3 |
| 5 |
=15×
| 3 |
| 5 |
| 5 |
| 9 |
| 3 |
| 5 |
=9+
| 1 |
| 3 |
=9
| 1 |
| 3 |
(2)
| 3 |
| 7 |
| 3 |
| 7 |
=
| 3 |
| 7 |
=(
| 3 |
| 7 |
| 3 |
| 7 |
=3×2+
| 3 |
| 7 |
=6+
| 6 |
| 7 |
=6
| 6 |
| 7 |
(3)
| 5 |
| 6 |
| 5 |
| 6 |
=
| 5 |
| 6 |
=
| 5 |
| 6 |
=10;
(4)42×(
| 1 |
| 6 |
| 1 |
| 7 |
=42×
| 1 |
| 6 |
| 1 |
| 7 |
=7+6
=13;
(5)24×(
| 5 |
| 6 |
| 7 |
| 12 |
=24×
| 5 |
| 6 |
| 7 |
| 12 |
=20-14
=6;
(6)
| 5 |
| 9 |
| 2 |
| 3 |
| 9 |
| 10 |
=
| 5 |
| 9 |
| 9 |
| 10 |
| 2 |
| 3 |
=
| 1 |
| 2 |
| 2 |
| 3 |
=
| 1 |
| 3 |
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