-3XX+36X=120
    183.36+（7y-467.56-(7y*0.13-14-112)*0.1）*0.75-260=0
    X（X+1）=121
    x=1/1+3/10+8/9+4/5
    x=1/1+3/10+8/9+5/4
    X=12323324X
    (1-5b/12)^2+(2-5b/6+b-3/2)^2=5/2
    n^2+(2n-12n/5+12/5-3/2)^2=5/2
    n^2+(2n-12n/5+5/12)
    (x+16)x＝1161
    （20+2x)(15+2x)-15×20＝246
    4×（x-8）²＝400
    4（x-8）²＝400
    x(x-1)=66*2
    (x*2*0.95)/3=33.8
    40x^2-30x+5=0
    30x^2-30x+5=0
    x*【120-0.5*(x-60)】=8800
    120x-0.5(x-60)=8800
    (x*2*0.75)/2=33.8

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