Mathematics
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    688÷x=66.47
    0 √3 √6 3 2√3
    x+(x*13%)=100
    3 4 4 16=12.25
    4:36
    e3
    X^2=50^2+(X-6.19)^2
    2【(30-2x)x+(20-2x)x】=200
    2【(30-x)x+(20-x)x】=200
    2(30-x)x+2(20-x)x=200
    2(30-x)+2(20-x)=200
    4(x-4)^2=400
    2^2-2(2k-1)=(2k-1)^2
    22-2(2k-1)=(2k-1)2
    20t-5t^2=0
    5x=7.2
    4x^2-2x-1=0
    (x-1)^2=6
    x^2-2x-5=0
    (3y-1)∧2

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