a) \(\frac{a-b}{c-d}+a^2\)
=(a-b)/(c-d)+sqr(a)
b) \(a^2-\frac{1}{2}+\frac{3+1}{2}\)
=sqr(a)-1/2+(3+1)/2
c) \(\left(x-1\right)^2-\left(y-2\right)^2\)
=(x-1)*(x-1)-(y-2)*(y-2)
d) \(a\cdot x\cdot x+b\cdot x+c\)
\(=ax^2+bx+c\)
e) 1/x-a/5*(b+a)
\(=\frac{1}{x}-\frac{a}{5}\cdot\left(b+a\right)\)
f) (a*a+b)*(1+c*c)
\(=\left(a^2+b\right)\left(c^2+1\right)\)
a. (a-b)/(c-d)+a*a
b. a*a - 1/2 - (3+1)/2
c. ((x-1)*(x-1)) - ((y-2)*(y-2))
d. a×x² + b×x+c
e. 1:x-a:5×(b+a)
f. (a²+b)×(1+c²)