8.4+0.2= 8.3-0.8= 9.7+5.7= 65.2-5=
0.3×0.7= 3.21÷1000= 0.25×0.4= 45×0.2=
524﹣237﹣63
85×97+85×3
630÷45
125×16×25
18+18×0= 4+6×2=
25×7×4= 34+26﹣34+74=
426﹣299= 0÷52+83=
4×4÷4×4=3 750÷3750+10=
7.3+3.7= 10-9.99= 9.9+0.11=
5.6+13.4= 2.8+0.01+7.2= 16×125×8=
= 90÷90%= =
= = 80×30%=
1÷1%= 4.5÷0.09=