2714=（r+8+0.25+8+0.25+4.5）*2*3.14*9+（r+8+0.25+4）*2*3.14*8+（r+4）*2*3.14*8
    0.016=0.92394x^-0.08+7-8*0.98839x^-0.02
    2x-4*2=0
    0.015947=(1-0.076057118)x^0.09+7-8*(1-0.011606516)x^0.02
    0.924x^0.09+7-7.907148x^0.02=0.016
    x^0.6=2
    （x+2）^11
    （x+2）^11
    2500×x＾4-8425×x＾2+22500=0
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1652341.67
    993.9x-x²=-0.4
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=448178.31
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1420075.9
    13196173.51+0.091284x=x
    13196173.51+0.091284x=x
    1/3.5x+x=50
    1000000*（1-1.56%）-236029.27-25000-（1000000/1.09*0.09-x/1.03*0.03）*1.12=x
    0.75=0.5+(x-30)*0.05-15*0.05
    x＾3-5x＾2+8x-4
    t^4=1

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