9%÷X=1.8
    （40÷X+8.5）÷（50÷X+6.8）=0.507÷0.493
    5（x^2）+36x-14=0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x＾3-2x∧2-144 = 0
    x3-2x2-144=0
    x3-2x2-144=0
    x3-2x2-144=0
    x^2-(1/7)x-3=0
    （10-X）/(10-15)=8300/12210
    （10+x）（280-10x）等于3120
    4500/x=6000/X+10
    4500/x=X+10/6000
    x^2-25x-300=0
    x*2x+x*5=600

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