x^4+8.602x^2-64.8025=0
    45x^2+1.5x-90=0
    x^2+17.64x-81=0
    x÷2-5=0.3x
    10X∧2-10X+1=0
    x×x÷2×2=32
    （26-x/2）x＝80
    x（16-2x）＝16
    （16-2x）x＝16
    6.3630 = -100076x^6+359182x^5-530131x^4+411321x^3-176632x^2+39703x-3634.9
    x（33-x）=130
    （x-30）[600-20（x-40）]=10000
    x^4-3x^2+1=0
    （x-30）[200-20（x-40）]=10000
    X^3-14X^2+17X＝196
    （5500-x）/（8250+x）＝1.5
    x^2-36x+320=0
    90-s+4s=9×15
    4x²+8x-6=0
    x^3-2x-5=0

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