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39x5X4=多少,用脱式计算

39x5X4=多少,用脱式计算 39x5X4 =39*(5*4) =39*20 =780

117×5÷39 =117÷39×5 =3×5 =15

64×5-270 =320-270 =50

197一12x5十38 =197-70+38 =127+38 =165

21.6÷0.8-1.2x5 =27-6 =21

=42÷42x5/7x5/7 =1x5/7x5/7 =25/49

25×5+2×25 =125+50 =175

=(48+17)X5 =65X5 =325

10.48+22.56÷4.7X5.4 =10.48+4.8X5.4 =10.48+25.92 =36.4 计算此类题目,先算乘除,后算加减,乘除并列,依顺序计算。

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