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±ÈÈç˵y=a*x^2=b*x
y(2)-y(1)=0
y(3)+y(4)=5
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syms a b x y f1 f2;
y=a*x^2+b*x;
f1=subs(y,x,1)-subs(y,x,0);
f2=subs(y,x,3)+subs(y,x,4);
[a,b]=solve('f1=0','f2=5','a','b')
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