x^2=2^x x=tanx 2^x=2x
    （30×4+20）×（100-x）+（30×3+20×4）×x=15000
    24*x^3+17*x^2+18*x-3=0
    x+x*1.15+x*1.15^2+x*1.15^3+x*1.75+x*2.01=202
    x+x*1.15+x*1.15^2+x*1.15^3+x*1.15^4+x*1.15^5=202
    x+x*1.15+x*1.15^2+x*1.15^3+x*1.15^4+x*1.15^5
    x=√1＋x∧2
    x*x+x-4=0
    √x+x=4
    m^2-2m=3/4
    143=（35-2x）x
    xx-5x+4=0
    440（1+x）(1+x)=633.6
    600(1-x)^2=486
    1/4x+2/5×(19-x)=4/5x
    (1-3÷4)x+(1-3÷5)×(19-x)=(1-1÷5)x
    (4x^2-4x)/(2x^2+1)=0
    （ X-60）（20+500-5 x）=2400
    32(x-1)^2/3+16sqrt(3)(x-1)/3=x^2-2x+4+4x(x-1)/sqrt(3)
    -28t^2-8t+21

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