(7x+70)÷(3x+70)=7÷4
    100*（1+i)^2=121
    x^3-3x^2+3x-1=0
    x^4-x^2-8x-48=0
    x^4+7x-30=0
    x^4+4x-24=0
    x+x*0.06=574
    56×7.88+12.08c=（56+c）×7.98
    (1-sqrt2)*y*y-2*sqrt2*y+4=0
    （1+sqrt2）y*y-2*sqrt2*y+4=0
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=88.503
    x/（202-x）=0.01
    x/202-x=0.01
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.072
    k ^ { 2 } - 43.9849 k + 9 = 0
    1000-4P=200+2(P-50)
    (n+2)^2+(3n/4+3)^2=(4/25)^2
    25n^2+136n-417=0
    19.2*(1-0.9^11)/(1-0.9)-19.2=Y
    19.2*(1-r^11)/(1-r)-19.2=114.7

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