递等式要巧算 0.3+0.3÷0.3-0.3×0.3 1.2÷1.25

0.3+0.3÷0.3-0.3×0.3 =0.3+1-0.9 =0.3+0.1 =0.4 1.2÷1.25 =6/5÷10/8 =6/5×8/10 =48/50 =96/100 =0.96