①62×0.98 ②6.4×0.5×0.25 ③4.68÷(4.68÷0.4) ④6.3×103-0.63×30
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1
①25×32×1.25
②(+0.375)÷(×)
③×+÷7
④6﹣(+)
①26×15﹣200
②8×4×12.5×0.25
③×+
④12÷[()×]