1÷25%=
0.22=
34-0.2=
16×2 ÷16 ×2=
1.4-1.08=
0×(1419-120)=
14+15÷14+15=
99×0.8+0.8=
79÷1415+13 1−(16+19)×310 712÷[34×(49−13)]
①311÷217÷1522
②46×745
③16÷(916-512)
④27÷53+57×35-0.6