7.99+3.1=
10.7-7=
50.03×1000=
1.9-1.9÷1.9=
0.1÷0.1÷0.1=
6.9×15.8-5.8×6.9=
8÷1.25=
10-0.24×5=
1.25×8÷1.25×0.8=