题目内容
计算,能简便的用简便方法.
|
| ||||||||||||
23×
| 6×[
| ||||||||||||
(
| (
|
(1)
×13+
=
×(13+1)
=
×14
=13;
(2)
×
+
×
=(
+
)×
=1×
=
;
(3)23×
+14×
=23×
+
×16
=(23+16)×
=39×
=14;
(4)6×[
-(
-
)]
=6×[
-
]
=6×
=
;
(5)(
+
+
)×48
=
×48+
×48+
×48
=42+8+32
=82;
(6)(
+
)×20
=
×20+
×20
=5+4
=9.
| 13 |
| 14 |
| 13 |
| 14 |
=
| 13 |
| 14 |
=
| 13 |
| 14 |
=13;
(2)
| 8 |
| 15 |
| 8 |
| 9 |
| 8 |
| 9 |
| 7 |
| 15 |
=(
| 8 |
| 15 |
| 7 |
| 15 |
| 8 |
| 9 |
=1×
| 8 |
| 9 |
=
| 8 |
| 9 |
(3)23×
| 14 |
| 39 |
| 16 |
| 39 |
=23×
| 14 |
| 39 |
| 14 |
| 39 |
=(23+16)×
| 14 |
| 39 |
=39×
| 14 |
| 39 |
=14;
(4)6×[
| 8 |
| 9 |
| 1 |
| 2 |
| 1 |
| 6 |
=6×[
| 8 |
| 9 |
| 1 |
| 3 |
=6×
| 5 |
| 9 |
=
| 10 |
| 3 |
(5)(
| 7 |
| 8 |
| 1 |
| 6 |
| 2 |
| 3 |
=
| 7 |
| 8 |
| 1 |
| 6 |
| 2 |
| 3 |
=42+8+32
=82;
(6)(
| 1 |
| 4 |
| 1 |
| 5 |
=
| 1 |
| 4 |
| 1 |
| 5 |
=5+4
=9.
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