2.4÷0.22.4 32.8÷0.2532.8×4
9.2×1.19.2÷1.1 1.561.56×0.28
0.58×6.69+6.69×0.42
(0.8-0.7+0.3)×6.69
6.69÷(0.59+0.1×0.1)
①
②7.5×8×12.5
③
④193﹣16﹣84