0.34+0.45=        0.57+0.9=          3.8+1.2=        10-2.5-2.5=

2.4×0.01＝     7.8÷100＝       1.08×4＝     1÷4＝

10÷0.5＝        0÷0.38＝       0.91÷9.1＝    0.25×2＝