①7.3×5.2+14.6
=37.96+14.6
=52.56；
②1379+450÷18×40
=1379+25×40
=1379+1000
=2379；
③（
1
2 -
1
3 ）×
3
7
=
1
6 ×
3
7
=
1
14 ；
④3÷4+
3
4 ×3
=
3
4 +
3
4 ×3
=（1+3）×
3
4
=4×
3
4
=3；
⑤（
9
10 ÷
3
5 +
1
2 ）×
3
4
=（
9
10 ×
5
3 +
1
2 ）×
3
4
=（
3
2 +
1
2 ）×
3
4
=2×
3
4
=1
1
2 ；
⑥
3
5 ÷[
7
8 -（
2
5 +
3
8 ）]
=
3
5 ÷[
7
8 -
31
40 ]．
=
3
5 ÷
1
10
=6．