(0.1*21.3413*0.9922)/(1+0.1*0.9922)*((100-0.1136-0.0104)/100)*(1/(1+0.31*0.0104))+2.13/1.4
    x^2-9x-100=0
    x^2-9x-10=0
    15×450
    (4/11）^2+3/4*4/11
    4/11^2+3/4*4/11
    x2＾x=1
    2＾0.464
    4456*14+26808
    (5-2x)(4-2x)
    x*10%=586.7
    x+50*8*0.2%+x*1.5%+x*10%+(x+x*10%)=586.7
    (x+50*0.2%+x*1.5%+x*10%)+(x+x*10%)=586.7
    (x+400*0.2%+x*1.5%+x*10%)+(x+x*10%)=586.7
    x+400*0.2%+x*1.5%=156
    (x+1)＋2(x＋1)＋3(x＋1)＋4(x＋1)=5(x＋1)+6(x-1)
    12-(3x-4)=4
    32x＋2(x-16)=36
    145-(5x＋34)=11
    8×(x＋4)=16×4

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