400×x（160+8）x+1500
    0.15X+X=197
    125=-16X*X+105X
    x－0.08x＝253
    x-（x*0.08）＝253
    sinx×sinx=49/65
    sinx×sinx=49/65
    4sinx+7cosx=0
    4sinx+7cosx=0
    2sinx—3cosx
    4sinx+7cosx=0
    4sinx+7cosx=0
    x＾4+x+1
    x=2^9
    x/(1+200/100)-x/(1+230/100)=300
    x/(1+200/100)-x/(1+230/100)=300
    x/(1+x/100)-x/(1+x*1.15/100)=300
    1000(1+m/2%)×500(1+m%)=660000
    1000(1+m/2)×500(1+m)=660000
    1000(1+m/2)×500(1+m)=660000

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