①l+O.64÷0.8-0.15,
=1+0.8-0.15,
=1.8-0.15,
=1.65;
②
2
11 ×[
3
4 -(
7
16 -
3
8 )],
=
2
11 ×[
3
4 -
1
16 ],
=
2
11 ×
11
16 ,
=
1
8 ;
③
2
5 ×18+32×
2
5 ,
=
2
5 ×(18+32),
=
2
5 ×50,
=20;
④
1
5 ÷[(
2
3 +
1
5 )×
1
13 ],
=
1
5 ÷[
13
15 ×
1
13 ],
=
1
5 ×15,
=3.