-=
3.2+6.08=
6.2+0.01=
×0.42=
8-8÷4=
12÷=
2÷-÷2=
×5÷×5=
0.52-0.42=
5÷20%=
5m:35cm(求比值)=
①17.8×31.2÷5.2
②1.6-1.2+37.8
③47.9--
④68×99