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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

5.73x4.27+5.73x5.73 =5.73x(4.27+5.73) =5.73x10 =57.3

102x54 =(100+2)x54 =100x54+2x54 =5400+108 =5508

题干不详

4.23x4.6+4.6x5.77 =4.6x(4.23+5.77) =4.6x10 =46 望采纳,谢谢!

89-12×5+31 =(89+31)-12×5 =120-60 =60

98x54+ 64x54+ 54x38 =54×(98+64+38) =54×200 =10800

21.6÷0.8-1.2x5 =27-6 =21

=42÷42x5/7x5/7 =1x5/7x5/7 =25/49

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