①30÷(4.8- 2.3)
②0.63÷0.7÷9
③2.6×1.2÷4
④(3.8+1.42)÷2.61
12.6÷6= 5.26-4.64= 20×0.25= 1.5÷50=
20÷2.5÷0.8= 3.2+0.08= 2.6÷13= 1÷0.08=
①0.69×99
②0.125×3.2×2.5
③0.99×9+0.99
④5.6×1.25
⑤1.63×1.73-1.63×0.73
⑥101×0.43