3.2+4.57=　          407+11.3+5.3=　         0.25×（44﹣8）=　       0.9+99×0.9=　   　
6.38×8×125%=　     10÷0.1﹣0.1÷10=　     7.9×4+2.7=　            4﹣4×0.6=　   　．