(4.06+5.6)÷2.3 3.6÷1.25÷0.8
4.5÷0.3×0.8 7.4-0.49÷0.07
0.8÷0.4×0.15 1.96÷0.8÷5 12.5×3.4×0.05×0.8
2.07+0.93÷0.3-1.83 8.6×9.9 0.25×[(23.5+8.5)÷0.8]
①3.4×7.8÷39
②0.36÷0.3÷4
③(2.3+4.42)÷1.4