①57.6﹣18.15+32.4﹣11.85
②78×25+1764÷49
③2.5×32×12.5
④3.6×[(37.5+18.5)÷2.8]
⑤÷[(﹣)×]
⑥199×99+178+21
①5.8﹣1.9﹣2.1
②×2.5××4
③÷(﹣)×
④83×0.75+17÷
261﹣99= 17÷34= 2.1+0.79= 80×125%=
÷36= 38.38÷38= +×0= ×3÷×3=
①(+-)÷
②12-(1+2)
③5÷[(+)×]
④2.5×3.2×0.125
⑤0.125×+×8.25+12.5%
⑥÷﹣