-3-x+2x^2+4x^3=0
    sqrt((1800^2)-(2250-0.5*x)^2)+sqrt(x^2-1350^2)=5100
    a+a*1%=73
    0.15745 = （0.021×X^1.85+0.25×1337.6）^0.5×X^0.84
    a+a*1%=68.85
    0.7=（0.021×X^1.85+0.25×1337.6）^0.5×X^0.84
    a+a*1%=206
    a+a*1%=120
    0.142÷x＝0.676÷0.86289
    0.4÷（100+0.4+0.18）＝x÷35.77
    arctan(x）+arctan(x/5)-90
    x^6+101x^2+100x^2-10000=0
    x^2+x-100=0
     0 = 0.7^5-x^5+lg2((0.5+0.5*0.7^5+0.5*x^5)^0.1)
     0.4 = 0.7^5+lg2((0.5+0.5*0.7^5+0.5*x^5)^0.1)
     0.4 = 0.7^5+lg2((0.5+0.7^5/2+0.5*x^5)^0.1)
    0.4=0.7^5+lg2((0.5+0.7^5/2*x^5)^0.1)
    0.4=0.7^5+lg2((0.5+0.5*x^5)^0.1)
    (6.25×10^(-5)-x)×(4.375×10^(-4)-2x)^2=(3.5×10^(-5)-x)×(1.5×10^(-5)-2x)^2
    5x=2

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