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
    x^2+4x
    9x²-72x+112=0
    （x—30）*（1—30%）/400=（x—40）*（1—20%）/200
    （800+X-12168.93）*(1-25%)+5213.15=5634.18
    x-4/x=90
    x^3+3x+6=0

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