12.22×0.98 12.22 0.64÷0.8 64÷8
1.6+0.4 1.6×0.4 4.5÷0.5 4.5×2
1.87÷0.931.87×0.93
5.2×1005.2÷0.01
需要4+3×1=7(根)小棒;
需要4+3×2=10(根)小棒;
需要4+3×3=13(根)小棒。
照这样算:
①( ﹣ )×24
②0.36×99+0.36
③20.8﹣(9.6+0.125÷12.5%)
④( ﹣ ÷2)×
⑤2.5×16×12.5
⑥0.5÷[ ﹣( ﹣ )]