[(1+r)^21-(1+r)]/r=26.31712
    5/X=0.1
    t+480-8t+30+120-t=170
    0.03972*45
    1.43/360
    672.66/82800
    200*414
    （2x+3）（3x-1）<0
    672.66/200*414
    2.46x/(1+1.46x)=0.044
    arctan10x-arctan0.25x-arctan5x=-90
    2.46x/(1+1.46x)=0.07778
    2.46x/(1+1.46x)=0.12824
    [(1+r)^21-(1+r)^11]/r=15.123
    2.46x/(1+1.46x)=0.19799
    0.518*414
    2.46x/(1+1.46x)=0.28484
    2.46x/(1+1.46x)=0.37967
    84.67*200*14.3=360x
    2.46x/(1+1.46x)=0.46957

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