①635+9030÷86×13,
=635+105×13,
=635+1365,
=2000;
②4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;
③45×101,
=45×(100+1),
=4500+45,
=4545;
④5.7-(1.9-1.3),
=5.7-1.9+1.3,
=5.7+1.3-1.9,
=7-1.9,
=5.1;
⑤
98
99 +
98
99 ×98,
=
98
99 ×(1+98),
=
98
99 ×99,
=98;
⑥
4
5 ÷〔
5
8 ×(
1
6 +
1
3 )〕,
=
4
5 ÷[
5
8 ×(
1
6 +
2
6 )],
=
4
5 ÷[
5
8 ×
1
2 ],
=
4
5 ÷
5
16 ,
=
4
5 ×
16
5 ,
=
64
25 ,
=2
14
25 .