-484.299t^{3}+5782.238744t^{2}+7027.999944t+3.14637 = 0
    x^2=2
    x^=2
    x^2+3x+2=0
    400-100=80%X-70%X
    400-100÷80%X-70%X
    （400-100）÷（80%X-70%X）
    26+9t-4.9t^2=30
    15%x-120=10%x+120
    15%x-10%x=120+120
    15%x+120=10%-120
    15%x-120=10%+120
    x^4+64x
    -2x*x*x+8x*x-23x-40=0
    -1/9（x-6）²+4 = 1
    （20- x）(35-2x)=558
    x+5x/10=6000
    x+7=8
    lnx+(lnx)/1
    -10.7478t^{3}-72.69113t^{2}+95.158t + 179.4246 = 0

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