1.简便计算下面各题。-|||-(1) (3) (1212-12.12)div (4848-48.48)-|||-(4) .725div 2.5div 32div 0.125-|||-(5) .87div 28.6times 4.59div 98.7times 2.86div 45.9-|||-(6) (6.4times 12.5times 0.5)div (2.5times 1.6times 0.2-|||-(7) .24times 0.1+0.5times 72.4+0.049-|||-times 724.98times 1.5-|||-(2) .7div 0.8-17.7div 0.81.简便计算下面各题。-|||-(1) (3) (1212-12.12)div (4848-48.48)-|||-(4) .725div 2.5div 32div 0.125-|||-(5) .87div 28.6times 4.59div 98.7times 2.86div 45.9-|||-(6) (6.4times 12.5times 0.5)div (2.5times 1.6times 0.2-|||-(7) .24times 0.1+0.5times 72.4+0.049-|||-times 724.98times 1.5-|||-(2) .7div 0.8-17.7div 0.81.简便计算下面各题。-|||-(1) (3) (1212-12.12)div (4848-48.48)-|||-(4) .725div 2.5div 32div 0.125-|||-(5) .87div 28.6times 4.59div 98.7times 2.86div 45.9-|||-(6) (6.4times 12.5times 0.5)div (2.5times 1.6times 0.2-|||-(7) .24times 0.1+0.5times 72.4+0.049-|||-times 724.98times 1.5-|||-(2) .7div 0.8-17.7div 0.8