2.1+4x=8.5 3x+2x=2.5
478÷10=
2.053×100=
7÷14=
0.6÷0.01=
2.4÷0.8=
7.2÷0.25=
5.6÷0.7=
5÷8=
56×0.9956
15.6×2.3156×0.23
1.8×101.8÷0.1
6.8平方分米6平方分米8平方厘米