5.6÷0.8= 3.6÷0.4= 0.72÷0.06=
100÷0.25= 0.3×0.3= 6.3÷0.09=
①1204+879+121
②74×60%+×25+0.6
③1.2÷×(0.6﹣)
④×[﹣(+)]