计算下列各题,能简算的要用简便方法计算:?
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(1)9.4×
1
4 +0.25×
3
5 ,
=9.4×0.25+0.25×0.6,
=(9.4+0.6)×0.25,
=10×0.25,
=2.5;
(2)
1
6 ÷[1÷(
3
5 -
3
10 )],
=
1
6 ÷[1÷
3
10 ],
=
1
6 ÷
10
3 ,
=
1
20 ;
(3)(
7
10 +
5
6 -
4
5 )×30×2,
=(
7
10 +
5
6 -
4
5 )×(30×2),
=(
7
10 +
5
6 -
4
5 )×60,
=
7
10 ×60+
5
6 ×60-
4
5 ×60,
=42+50-48,
=92-48,
=44;
(4)
3
14 ×(
3
4 -
1
10 ÷2),
=
3
14 ×(
3
4 -
1
20 ),
=
3
14 ×
14
20 ,
=
3
20 .,9, 计算下列各题,能简算的要用简便方法计算:
9.4× 1 4 +0.25× 3 5
1 6 ÷[1÷( 3 5 - 3 10 )] ( 7 10 + 5 6 - 4 5 )×30×2 3 14 ×( 3 4 - 1 10 ÷2)
1
4 +0.25×
3
5 ,
=9.4×0.25+0.25×0.6,
=(9.4+0.6)×0.25,
=10×0.25,
=2.5;
(2)
1
6 ÷[1÷(
3
5 -
3
10 )],
=
1
6 ÷[1÷
3
10 ],
=
1
6 ÷
10
3 ,
=
1
20 ;
(3)(
7
10 +
5
6 -
4
5 )×30×2,
=(
7
10 +
5
6 -
4
5 )×(30×2),
=(
7
10 +
5
6 -
4
5 )×60,
=
7
10 ×60+
5
6 ×60-
4
5 ×60,
=42+50-48,
=92-48,
=44;
(4)
3
14 ×(
3
4 -
1
10 ÷2),
=
3
14 ×(
3
4 -
1
20 ),
=
3
14 ×
14
20 ,
=
3
20 .,9, 计算下列各题,能简算的要用简便方法计算:
9.4× 1 4 +0.25× 3 5
1 6 ÷[1÷( 3 5 - 3 10 )] ( 7 10 + 5 6 - 4 5 )×30×2 3 14 ×( 3 4 - 1 10 ÷2)
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