①16.4÷25÷4
②6.9×3.6+3.6×3.1
③14.4+1.25÷0.5
④(16.8+4.9)÷0.7
12.5×5.6×0.8 4.6×1.01
14.89-2.3×0.9-0.93 0.4×[10-(9.4-5.4)]
7.62+2.5×8 9.8÷1.4-1.5
2.5×71.71×0.4 1.25×9.93-1.93×1.25
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1
①7.4﹣6.62+20.6﹣13.38
②×+×
③(-+)÷
④2×0.8×12.5×50%
⑤÷(÷+)
⑥×[1÷(+)]