49-1.57*29.75
    （6260-4*29.75*49）/（3813-4*29.75*29.75）
    198.24+115.95*100
    3647.75-115.95*29.75
    （465708-4*29.75*3647.75）/（3813-4*29.75*29.75）
    （17*30+30*49+32*50+40*67）
    （17*30+30*49+32*50+40*67）/4
    （30+49+50+67）/4
    （2216+3542+3943+4890）/4
    （17+30+32+40）/4
    17*17+30*30+32*32+40*40
    17*2216+30*3542+32*3943+40*4890
    16*(1.78*10^20)
    3*450+3*900+4*2100+2*2400
    (20/1.05+40/1.05^2+1020*3/1.05^3)/918.30256
    (50/1.05+100/1.05^2+150/1.05^3+1050*4/1.05^4)/1000
    (50/1.15+100/1.15^2+150/1.15^3+1050*4/1.15^4)/714.5021634
    (50/1.15+50/1.15^2+50/1.15^3+1050/1.15^4)/714.502164
    (20/1.15+40/1.15^2+3060/1.15^3)/703.180734
    （20/1.05+40/1.05^2+3060/1.05^3)/918.30256

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