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58x46 56x54怎么脱式计算

58x46 56x54怎么脱式计算 58x46 56x54 =56*46+2*46+56*54 =56*(46+54)+2*46 =5600+92 =5692

2.58x4.2+45.6 =10.836+45.6 =10.836+45+0.6 =55.836+1-0.4 =56.436

58×57分之5 =(57+1)×57分之5 =57×57分之5+1×57分之5 =5+57分之5 =5又57分之5

42×(58+62)÷56 =42×120÷56 =5040÷56 =90

原式=(100+2)×58 =100×58+2×58 =5800+116 =5916

58×(20-78÷13) = 58×(20-6) = 58×14 = 812

101×58-58 =58×(101-1) =58×100 =5800

58.(58+42)=5800

58×59-59+43×59 =(58-1+43)×59 =100×59 =5900

(58+37)÷(50-9×5) =95÷(50-45) =95÷5 =19

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