①960-900÷4÷25
②28.1-5.7+1.9-4.3
③4×()-0.4
④3.7×+1.3÷
⑤10÷()
⑥
6+8=
8+6=
14-6=
14-8=
5+70=
70+5=
75-5=
75-70=