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用简便方法计算.(1)112×5+112(2)5710×310+310×310(3)45×8×58×14(4)24×(38+34)
题目详情
用简便方法计算. (1)
| (2)
| ||||||||||||
(3)
| (4)24×(
|
▼优质解答
答案和解析
(1)
×5+
,
=
×(5+1),
=
×6,
=
.
(2)
×
+
×
,
=(
+
)×
,
=6×
,
=
,
=1
;
(3)
×8×
×
,
=(
×
)×(8×
),
=
×5,
=1;
(4)24×(
+
),
=24×
+24×
,
=9+18,
=27.
1 |
12 |
1 |
12 |
=
1 |
12 |
=
1 |
12 |
=
1 |
2 |
(2)
57 |
10 |
3 |
10 |
3 |
10 |
3 |
10 |
=(
57 |
10 |
3 |
10 |
3 |
10 |
=6×
3 |
10 |
=
9 |
5 |
=1
4 |
5 |
(3)
4 |
5 |
5 |
8 |
1 |
4 |
=(
4 |
5 |
1 |
4 |
5 |
8 |
=
1 |
5 |
=1;
(4)24×(
3 |
8 |
3 |
4 |
=24×
3 |
8 |
3 |
4 |
=9+18,
=27.
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