a(a-1)(a+2)(a+3)
    -5/9×1/3-4/3
    x^4+3*x^2+2*x+1=0
    （3x＋9）：（5x+9）=2：3
    40*0.85x+15*0.15x=14310
    2.6x-6.5+3.5=10
    5.4x+x=12.8
    13x-6.8+1.8x=56.8
    12－17535866
    210*3+139*8+104*15+44*30+32*40+44*50+32*60+32*70+13*80+77*90+2*100
    210*3+139*8+104*15+44*30+32*40+44*50+32*60+13*70+77*80+2*100
    210*3+139*8+104*15+44*30+32*40+44*50+32*60+13*70+77*80+2*300
    210*3+139*8+104*15+44*30+32*50+44*60+32*70+13*100+77*160+2*200
    210*3+139*8+104*15+44*30+32*60+44*80+32*90+13*100+77*200+2*300
    210*3+139*8+104*15+44*30+32*60+44*80+32*100+13*150+77*250+2*300
    (1+0.06/4)^4-1
    sqrt(45*45-(15+20sqrt(2))^2)
    45*45-(15+20sqrt(2))^2
    2000*(1-(1/1.05)^5)/0.05+1000*(1-(1/1.05)^10)/(0.05*1.05^5)
    0.5*4268^2*166/180*3.14-4236*sqrt(4268^2-4236^2)

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