x×2.75＝163.336-x
    x×2.55＝163.336-x
    x×2.35＝163.336-x
    x×2.15＝163.336-x
    x×1.95＝163.336-x
    x×1.75＝163.336-x
    cosx=-0.3
    3Q^{2}-20Q-75=0
    9Q^{2}-40Q-75=0
    -4a=4
    a=1 ax2
    c=1+9
    2+3=c c=
    x*x-2x-3=0
    0=-1/2x*x+2x+6
    6.5/87-60/1650+X/126=0.00214（X+66.5)
    6.5/87-60/1650+X/126=0.00154（X+66.5)
    5x^2+610x-615
    2(x+5)+3x=35
    6^x＝x^18

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