(3500Q*0.13-(5+150Q)-140)*0.12
    3500Q-(120+2000Q+231.75)=0
    3500Q-(120+2000Q+231.75)-(3500Q*0.13-(5+150Q)-140)*0.12=0
    (3500Q*0.13-(5+150Q)-140)*0.12=0
    3500Q-(120+2000Q+231.75)-(3500Q*0.13-(5+150Q)-140)*0.12
    x^2-13.9x+40.2=0
    x^2-9.8x+11.1=0
    7x-5（2.2+x)=6.5
    2(1+x)^6+2(1+x)^5+2(1+x)^4=7.2
    2(1+x)^6+2(1+x)^5+2(1+x)^4=6
    2x+1.3=2.8-3x
    450Q-(70+240Q+171+69.02)-（450Q*0.13-15Q-30.4）*0.12=0
    450Q-(70+240Q+171+69.02)-（450Q*0.13-15Q-30.4）=0
    Q×450-（310.02+Q×240）-（Q×450×13％-Q×15-30.4）×12％=0
    450Q-(70+240Q+171+69.02)-(450Q*0.13-15Q-30.4)
    450Q-(70+240Q+171+69.02)
    450Q-(70+450Q+171+69.02)
    450Q-(70+450Q+171+69.02)-(450Q*0.13-15Q-30.4)
    450Q*0.13-15Q-30.4
    xtanx=40

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