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1+20分之13= 1-17分之9= 9分之5-2分之1= 1又12分之...

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

1-6分之5+12分之7-20分之9+30分之11-42分之13+56分之15怎样简便计 1-6分之5+12分之7-20分之9+30分之11-42分之13+56分之15 =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) =1-1/2-1/3+1/3+1/4-1/4-1/5+1/5-1/6+1/6-1/7+1/7+1/8...

=(1-1/2)+(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)=1-1/2+1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6=1-1/6=5/6

是这样的吧1+1/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72=1+1/2-(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+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8-1/8-1/9=1-1/9=8/9

化为同分母

1+ 1/2 - 5/6 + 7/12 - 9/20 + 11/30 - 13/42 + 15/56 = 1 + 1/2 - 3/6 - 2/6 + 4/12 + 3/12 - 5/20 - 4/20 + 6/30 + 5/30 - 7/42 - 6/42 + 8/56 + 7/56 = 1 + 1/2 - 1/2 - 1/3 + 1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 - 1/6 - 1/7 + 1/7 + 1/8 = ...

原式=1+1/2-(3-1/6)-(3+1/12)-(5-1/20)+5+1/30-(7-1/42)+7+1/56+(9-1/72)+9+1/90 =(1-3-3-5+5-7+7+9+9)+(1/2+1/6-1/12+1/20+1/30+1/42+1/56-1/72+1/90) =13又127/180

你的题目抄错了? 我感觉应该是 9分之5×7又12分之5+9分之1×1又12分之7×5 【解】 9分之5×7又12分之5+9分之1×1又12分之7×5 =9分之5×7又12分之5+9分之1×5×1又12分之7 =9分之5×7又12分之5+9分之5×1又12分之7 =9分之5×(7又12分之5+1又12分之7) =9分之...

486856

1-5/6+7/12-9/20+11/30-13/42+15/56 =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) =1-1/2+1/8 =5/8

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