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计算:1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+12/35

1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+12/35 =1/3+3/4+2/5+5/7+7/8+(1/4+1/5)+(1/3+1/7)+(1/3+1/8)+(1/5+1/7) =(1/3+1/3+1/3)+(3/4+1/4)+(2/5+1/5+1/5)+(7/8+1/8)+(5/7+1/7+1/7) =4+4/5 =4.8

1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+19/35 =1/3+3/4+2/5+5/7+2/8+5/8+1/4+1/5+1/3+1/7+1/3+1/8+2/5+1/7 =(1/3+1/3+1/3)+(3/4+1/4)+(2/5+2/5+1/5)+(2/8+5/8+1/8)+(5/7+1/7+1/7) =1+1+1+1+1 =5

1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+19/35 =1/3+3/4+2/5+5/7+7/8+(4/20+5/20)+(3/21+7/21)+ (3/24+8/24)+(5/35+14/35) =1/3+3/4+2/5+5/7+7/8+1/5+1/4+1/7+1/3+1/8+1/3+2/5+1/7 =1/3X3+(3/4+1/4)+(2/5+1/5+2/5)+(5/7+1/7+1/7)+(7/8+1/8) =1+1+...

采纳哦

3/5+6/7+5/6+7/12+9/20+11/30+13/42 =3/5+6/7+(1/2+1/3)+(1/3+1/4)+(1/4+1/5)+(1/5+1/6)+(1/6+1/7) =(3/5+1/5+1/5)+(6/7+1/7)+(1/2+1/4+1/4)+(1/3+1/3+1/6+1/6) =1+1+1+1 =4

您好: 3/2-5/6+7/12-9/20+11/30-13/42 =(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7) =1-1/7 =6/7 如果本题有什么不明白可以追问,如果满意记得采纳 如果有其他问题请另发或点击向我求助,答题不易,请谅解,谢谢。...

16.40226

1+1又1/2+5/6+7/12+9/20+11/30(简便计算) =2又1/2+1/2+1/3+1/3+1/4+1/4+1/5+1/5+1/6 =3+2/3+1/2+2/5+1/6 =3+2/3+(1/2+1/6)+2/5 =3+2/3+2/3+2/5 =4又1/3+2/5 =4又5/15+6/15 =4又11/15

1-5/6+7/12-9/20+11/30-13/42+15/56-17/72 =1-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)-(1/8+1/9) =1-1/2-1/9 =1/2-1/9 =9/18-2/18 =7/18 扩展资料: 一、简便计算的方法: 1、整体简便计算。 2、局部简便计算。 3、中途简...

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