脱式计算,能简算的要用简便方法计算.
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(1)
17
20 ×
5
7 +
2
7 ×
17
20 ,
=
17
20 ×(
5
7 +
2
7 ),
=
17
20 ×1,
=
17
20 ;
(2)
7
20 ÷[
1
2 ×(
2
3 +
4
5 )],
=
7
20 ÷[
1
2 ×
22
15 ],
=
7
20 ÷
11
15 ,
=
7
20 ×
15
11 ,
=
21
44 ;
(3)12×(
1
4 +
1
6 ),
=12×
1
4 +12×
1
6 ,
=3+2,
=5.
17
20 ×
5
7 +
2
7 ×
17
20 ,
=
17
20 ×(
5
7 +
2
7 ),
=
17
20 ×1,
=
17
20 ;
(2)
7
20 ÷[
1
2 ×(
2
3 +
4
5 )],
=
7
20 ÷[
1
2 ×
22
15 ],
=
7
20 ÷
11
15 ,
=
7
20 ×
15
11 ,
=
21
44 ;
(3)12×(
1
4 +
1
6 ),
=12×
1
4 +12×
1
6 ,
=3+2,
=5.
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