x^2+1
    y=0.2*(-5)-4
    9（x-5）÷6=1.5
    79931*x*1000/1.218/(22*5+x) = 38534.04
    79931000x/1.218/(110+x)=37892
    5*x^15+5*x^14+5*x^13+5*x^12+5*x^11-1.75*x^10-1.75*x^9-1.75*x^8-1.75*x^7-1.75*x^6-1.75*x^5-1.75*x^4-1.75*x^3-1.75*x^2-1.75*x=24.2241
    x²－159x+2700＝0
    90-4(x+1)=10
    9(x-5)÷6=1.5
    9(x-5)÷6=1.5
    0.8*x+0.2/x=1
    0.2*x+0.8/x=1
    0.4*x+0.6/x=1
    50x^26+50x^27+50x^28+50x^29+50x^30 =1205.88
    50x^25+50x^24+50x^23+50x^22+50x^21 =880.339
    50x^20+50x^19+50x^18+50x^17+50x^16 =647.979
    50x^15+50x^14+50x^13+50x^12+50x^11=459.674
    50x^10+50x^9+50x^8+50x^7+50x^6 =314.541
    44.5*n^7+50*n^6+50*n^5=172.7738
    9*(x-5)÷6=1.5

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