
用简便方法计算下面各题.(1)54×120+45÷20+120(2)(16+18+124)×24(3)37?(34?47)(4)3×37十4÷7
用简便方法计算下面各题.(1)54×120+45÷20+120(2)(16+18+124)×24(3)37?(34?47)(4)3×37十4÷73....
用简便方法计算下面各题.(1)54×120+45÷20+120(2)(16+18+124)×24(3)37?(34?47)(4)3×37十4÷73.
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(1)54×
+45÷20+
,
=(54+45+1)×
,
=100×
,
=5;
(2)(
+
+
)×24,
=
×24+
×24+
×24,
=4+3+1,
=8;
(3)
?(
?
),
=
+
?
,
=1?
,
=
;
(4)3×
十4÷
.
=(3+4)×
,
=7×
,
=3.
1 |
20 |
1 |
20 |
=(54+45+1)×
1 |
20 |
=100×
1 |
20 |
=5;
(2)(
1 |
6 |
1 |
8 |
1 |
24 |
=
1 |
6 |
1 |
8 |
1 |
24 |
=4+3+1,
=8;
(3)
3 |
7 |
3 |
4 |
4 |
7 |
=
3 |
7 |
4 |
7 |
3 |
4 |
=1?
3 |
4 |
=
1 |
4 |
(4)3×
3 |
7 |
7 |
3 |
=(3+4)×
3 |
7 |
=7×
3 |
7 |
=3.
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