用简便方法计算下面各题. 17 12 × 5 34 × 3 4 5 7 ×72- 5 7 ×23 14 17 + 14?
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(1)
17
12 ×
5
34 ×
3
4 ,
=
5
32 ;
(2)
5
7 ×72-
5
7 ×23 ,
=
5
7 ×(72-23),
=
5
7 ×49,
=35;
(3)
14
17 +
14
17 ×16 ,
=
14
17 ×(1+16),
=14;
(4)(
1
4 +
1
6 )×24,
=
1
4 × 24+
1
6 ×24,
=6+4,
=10;
(5)
1
8 ×5×
8
9 ,
=
5
9 ;
(6)
6
5 ×3+
6
5 ×6+
6
5 ,
=
6
5 ×(3+6+1),
=
6
5 ×10,
=12.,1, 用简便方法计算下面各题.
17 12 × 5 34 × 3 4
5 7 ×72- 5 7 ×23
14 17 + 14 17 ×16
( 1 4 + 1 6 )×24
1 8 ×5× 8 9
6 5 ×3+ 6 5 ×6+ 6 5 .
17
12 ×
5
34 ×
3
4 ,
=
5
32 ;
(2)
5
7 ×72-
5
7 ×23 ,
=
5
7 ×(72-23),
=
5
7 ×49,
=35;
(3)
14
17 +
14
17 ×16 ,
=
14
17 ×(1+16),
=14;
(4)(
1
4 +
1
6 )×24,
=
1
4 × 24+
1
6 ×24,
=6+4,
=10;
(5)
1
8 ×5×
8
9 ,
=
5
9 ;
(6)
6
5 ×3+
6
5 ×6+
6
5 ,
=
6
5 ×(3+6+1),
=
6
5 ×10,
=12.,1, 用简便方法计算下面各题.
17 12 × 5 34 × 3 4
5 7 ×72- 5 7 ×23
14 17 + 14 17 ×16
( 1 4 + 1 6 )×24
1 8 ×5× 8 9
6 5 ×3+ 6 5 ×6+ 6 5 .
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