x^2+0.052x-0.10044=0
    x^5-x+1 x^2+log(2,-x) 2^x+x+1
    x^3-5x^2+3x+2 x^3-3x^2+4x+1 x^3-3x^2+9/4x-1 x^3-2x^2+x+2
    （a-3.9）÷a=0.15
    arctan0.1w+arctan0.2w=46
    arctan0.1w+arctan0.2w=45
    62.5% X十（288-x）x75%=200
    1-x=2
    （84798-2.5X）*12/22*0.9=19239+10X
    500*X^2+3434*X-3434*1950=0
    3xx+6x+2=0
    6859X^2+361X-288=0
    3x^4+8x^3+8x^2-8x+4=0
    (－2.3470x^4+29.4110*x^3－141.1690*x^2+266.5489*x+122.8429）*7.63*0.85/0.485=1572.9+0.071*0.377^2*0.485^2*x^2*1000000/7.63^2
    －2.3470*x^4＋29.4110=0
    -2.4296x^5+66.8872x^4-711.4745x^3+3753.6011x^2-9421.7066x+8928.2513 = 2500
    -2.4296x^5+66.8872x^4-711.4745x^3+3753.6011x^2-9421.7066x+8928.2513 =2000
    -2.4296x^5+66.8872x^4-711.4745x^3+3753.6011x^2-9421.7066x+8928.2513 = 1500
    -2.4296x^5+66.8872x^4-711.4745x^3+3753.6011x^2-9421.7066x+8928.2513 = 1000
    -2.4296x^5+66.8872x^4-711.4745x^3+3753.6011x^2-9421.7066x+8928.2513 = 750

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