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35十3x7脱式计算

35+3x7 =35+21 =56

35×30加35×3 =1050+105 =1155

简便方法脱式计算 19×35+19 =19×(35+1) =19×36 =684

脱式计算: 209+102÷(53-35) =209+102÷18 ≈209+5.67 ≈2

37×(38分之5) 解:原式=(38-1)×(38分之5) =38×(38分之5)-1×(38

75乘12加280除35的脱式计算 75*12+280/35 =75*2*6+280/7/5

23/56x57的脱式计算 =23/56x(56+1) =23/56x56+23/56 =23+23

原式 =320x25x125 =(40x8)x25x125 =(40x25)x(8x125)

25-20÷5=25-4=21

原式 =5x27+63x5 =5x(27+63) =5x90 =450

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