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clear
syms n y
y = 0;
n = 0;
while y <= 3
    n = n+1;
    y = y+1/(2*n-1);
end
if y > 3
    n = n-1;
end
disp 'y<3ʱ,����nֵΪ'
n
y = y-1/(2*n+1)