①0.78×7.2+0.78×2.8
②1.25×17×8
③5.6×4.5-4.6×4.5
④4.2×1.01
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÷[()×]