① ÷[1-( + )]
②48×( + - )
③12.5×7×3.2
21.36÷0.8﹣12.9
×53+0.6×46+60%
(24.6+5.4)×(75﹣34.5÷2.3) 2.5×0.8×4×12.5
(2.8+2.8+2.8+2.8)×2.5 6+2.4+3+7.6
①3.5×0.6﹣5.4÷4.5
②0.6÷[(1+75%)×]
③☆()
④☆