f(-3)=5(-3)^2=5*9=45
f(a^3)=5(a^3)^2=5a^6
f(a-3)=5(a-3)^2=5(a^2-6a+9)=5a^2-30a+45
f(3x)=5(3x)^2=5*9x^2=45x^2
<span>120:6=20см</span><span>20=1\6</span><span>5*20=100смВроде так)</span>