8.6×0.1= 2.4÷0.3= 18÷0.2= 8.1÷0.9=
5.4÷6= 0.42÷0.6= 9×0.8= 0.025×4=
①3.8+4.29+2.71+4.2
②(16.8+1.47)÷0.7
③1.25×2.5×3.2
④0.56×99
0.36+0.64×5
3.6×6.1+3.9×3.6
27.9×99+27.9
2.5×3.2×12.5
3.5×102
8×(20–1.25)