(1)
7
9 +
3
8 +
5
8 +
2
9 ,
=(
7
9 +
2
9 )+(
3
8 +
5
8 ),
=1+1,
=2;
(2)36× (
3
4 +
1
6 -
2
9 ) ,
=36×
3
4 +36×
1
6 -36×
2
9 ,
=27+6-8,
=25;
(3)3.4×2.77+0.23×3.4,
=3.4×(2.77+0.23),
=3.4×3,
=10.2;
(4)[1-(
1
2 +
1
6 )] ÷
1
3 ,
=[1-
2
3 ] ÷
1
3 ,
=
1
3 ÷
1
3 ,
=1.