用简便方法计算下面各题: 1 15 ×( 1 3 + 1 12 ) 3.14×9.9+0.314 3 4 ÷1.25÷8?
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(1)
1
15 ×(
1
3 +
1
12 ),
=
1
15 ×
5
12 ,
=
1
36 ;
(2)3.14×9.9+0.314,
=0.314×99+0.314,
=0.314×(99+1),
=0.314×100,
=31.4;
(3)
3
4 ÷1.25÷8,
=
3
4 ÷(1.25×8),
=
3
4 ÷10,
=
3
4 ×
1
10 ,
=
3
40 .,1, 用简便方法计算下面各题: 1 15 ×( 1 3 + 1 12 ) 3.14×9.9+0.314 3 4 ÷1.25÷8.
1
15 ×(
1
3 +
1
12 ),
=
1
15 ×
5
12 ,
=
1
36 ;
(2)3.14×9.9+0.314,
=0.314×99+0.314,
=0.314×(99+1),
=0.314×100,
=31.4;
(3)
3
4 ÷1.25÷8,
=
3
4 ÷(1.25×8),
=
3
4 ÷10,
=
3
4 ×
1
10 ,
=
3
40 .,1, 用简便方法计算下面各题: 1 15 ×( 1 3 + 1 12 ) 3.14×9.9+0.314 3 4 ÷1.25÷8.
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