7.2-3x=2.46
    2tanx/1-（tanx）^2=-4(tanx+1)/1-tanx
    2tanx/1-（tanx）^2=-4(tanx+1)/1-tanx
    tan2x
    （4十√5）x2十（2一√5）x一1＝0
    192（1+x）²=300
    -x²+2x+4=0.5
    20/5X=80
    4^n-2^n＝240
    x^2-x-e=0
    x^2-x-1=0
    x^2-x-e=0
    10x+2x^2=119
    X+(2X+16)=91
    7.2-3X=2.46
    7.4X-3.9=4.8X+11.7
    7.2-3X=2.46
    7.4X-3.9=4.8X+11.7
    21x2-112x-124=0
    (10-7.5)X=1

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