6.3+3.07=
3.2÷1%=
9-9÷12=
33+42=
0.24t:1.2kg=
1+1%=
3.14×0.5=
0.1÷0.1÷0.01=
5÷56-56÷5=
0.32-0.22=
49÷4=
38-38×0.8=
0.15:0.3=
3.5+4.5=
13+17=
3.6÷40%=
4r2-22=
2.01-0.1=
715:2125=
20×15%=
711×5÷711×5=