57.5﹣4.25﹣15.75
642÷6= 0.9×99+0.9= 1.25×80= 2.5÷0.01=
÷ = 2﹣ ﹣ = 3﹣ ﹣ = ( ÷ )×30=
56×10%= 3.2+1.78= ﹣= 0.72÷0.6=
1.25×8= 4÷= ×= ×6÷×6=
①×× ②+÷
③0.38×99+38% ④-(-)
0.25×3.2×1.25
9
6.35﹣
69×75%+7.5×3.1