5/7*7/20-1/2+4/10
    5/7*7/20-1/2+4/7
    5/7*7/20
    5/7*9/7
    1/7*7/9+3/4-1/2
    1/7*7/9
    1/7*2/6
    13/9-6/13
    5/13-2/9
    9/11+（5/13-2/9）-1/13
    198/245-13/11
    37/18-9/11
    37/18-9/11-13/11
    141/136-1
    141/136
    5/8+7/17
    （X-12%)/(14%-12%)=(5-5.3282)/(4.9464-5.3282)
    2/3:1/3 = x:4/9
    258/67÷6－42/51
    （480/2）-（600/2x）=45

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