0=-3/8(x-1.6)²+16
    15=-3/8x²+16
    0=-3/8(x-4)²+16
    -x^3-6x^2-4x+8=0
    6x=(x-28)*7.2
    x/48x=48/x
    x/48x=48x
    x+1.6*(16%-x)=22%
    300/x-300/5/4x=3
    255-（1/2）a = a
    300/x-3=300÷（5/4×x）
    5000x^15+5000x^14+5000x^13+5000x^12+5000x^11 =37750
    5000x^15+5000x^14+5000x^13+5000x^12+5000x^11 =377500
    255-(5/2)t = 5t
    225-（1/2)a = a
    -13X2-32X3+108X-13/4=0
    a∧2-[(2+2√2)a∧2]/√2+2＝-a+[a(2+2√2) ]/√2
    18.2=-6t-0.1t^2
    18.2=-6t-1/2*0.2t^2
    -(sqrt(3)/2)*x+1/2(x^2)-2=1/4(x^2)+(sqrt(3)/2)*(x^3)-2*sqrt(3)x+3/4(x^2-4)^2-4

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