48﹣2.3×12
0.25×6.47×40
7.28+32÷0.25
①1204+879+121
②74×60%+×25+0.6
③1.2÷×(0.6﹣)
④×[﹣(+)]
①15.28﹣3.6﹣3.4
②()×7.2
③
④7.5÷[(6.8﹣4.3)×0.12]
①
②36×()
④
⑤3.24×0.76+3.24×0.24
⑥