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列竖式计算9/7+1/8+3/8+5/7

9/7+1/8+3/8+5/7 =(9/7+5/7)+(1/8+3/8) =14/7+4/8 =2+1/2 =2又2分之1

=(9/7+5/7)-(1/8+3/8) =2-1/2 =3/2

5/8+1/7+3/8 =5/8+3/8+1/7 =1+1/7 =1又1/7

如图

80/72

1/6+1/5+1/2 =5/30+6/30+15/30 =11/30+15/30 =13/15

37.5%*5/7+1/7x3/8+3/8÷7 =3/8*5/7+3/8*1/7+1/8*1/7 =3/8*(5/7+1/7+1/7) =3/8*1 =3/8

4/3—(2/5+3/1O丿=4O/3O一{I2/30+9/3o)=4o/30_21/3o=丨9/30先通分再计算

方程思想,令x=1+2+3+……+98+99+100, 倒序写,∴x=100+99+98+……+3+2+1, 那么2x=101+101+101+……+101+1101+101,(计100个) =101*100, ∴x=101*100/2=101*50=5050, 高斯小时候计算应用加法交换律,分成50组,即 1+2+3+……+98+99+100 =(1+101)+(2...

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