1.2x-0.8x=240 2(x+1.2)=13.8÷3
1.5÷0.75+0.25×40 2025×0.9+202.5
1.37÷0.25÷4 (1.26+0.54)÷(1.5×0.8 )
1.2×0.4=
0.25×40=
3.2÷1.6=
1.5×0.8=
2.4÷0.6=
1.6÷0.5=