①0.25×1.25×3.2
②36×( + ﹣ )
③
④
20%x-5.6=1.4
①12×14.5+12×550%
②35×9.9
③32×2.5×12.5
④12÷[(2.2-40%)×]
①∶=x∶
②x∶0.8=0.25∶
①
②
③7.85×101