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
    x+78=91
    （a-22）（-5a+20）=325
    100-3x=100-4x
    3x=4x
    100-3x=4x
    x/(x+11200)=15%

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