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x梅1/4=5/12梅3/4

x÷1/4=5/12÷3/4 4x=5/9 x=5/9÷4 x=5/36

x一(1/3一1/4)=5/12 解:x-1/12=5/12 x=5/12+1/12 x=1/

3/4减x等于5/12 (3/4)-x=5/12, x=(3/4)-(5/12), x=(9/

5/12x-1/3=-1/4 5/12x×12-1/3×12=-1/4×12 5x-4=-3

证明:1+2+3+4+5+6+…=-1/12 假设S1=1-1+1-1+1-1… S2=1-2+3-

12*(3/4 +1/3 - 5/6)=12*(9+4-10)/12 =3

4/5-5/12+1/3的和等于60分之43

下面分数是上面分数的一半,x=24。

第一题 X=21/28-12/28 X=9/28 第二题 X=10/24+9/24 X=19/24

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