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x一5/7=2/7

X+3/5=8 解:X=8-3/5 X=7又2/5 3/8+5/7÷2/7 =3/8+5/2 =2又7/8 3/8+5/7x1/5 =3/8+1/7 =29/56

x:1/2=2/5:7/8 解:7/8x=1/2*2/5 7/8x=1/5 x=1/5÷7/8 x=8/35

7/x-2=5/3 7/x=5/13 x=5/91

解答如下图:

1/3:2/5=2/7:x 1/3 x=2/5×2/7 1/3x=4/35 x=12/35

3/5(1-x+2/3)=2/7(x+1) 3/5(5/3-x)=2/7x+2/7 1-3/5x=2/7x+2/7 31/35x=5/7 x=25/31

5/21x2/7+2又19/21x5/7+(1-3/7) =2/21x5/7+2又19/21x5/7+4/7 =(2/21+2又19/21)x5/7+4/7 =3×5/7+4/7 =15/7+4/7 =2又5/7

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