(1)
5
7 +
9
10 +
11
10 +
2
7 ,
=(
5
7 +
2
7 )+(
9
10 +
11
10 ),
=1+2,
=3;
(2)44×(
5
11 -
1
4 ),
=44×
5
11 +44×
1
4 ,
=20-11,
=9.
(1)
5
7 +
9
10 +
11
10 +
2
7 ,
=(
5
7 +
2
7 )+(
9
10 +
11
10 ),
=1+2,
=3;
(2)44×(
5
11 -
1
4 ),
=44×
5
11 +44×
1
4 ,
=20-11,
=9.