[tex]240.\\1)\\b^2-4b=(-2)^2-4\cdot(-2)=4+8=12\\\\b^2-4b=0,5^2-4\cdot 0,5=0,25-2=-1,75\\\\\\2)\\x^2-y^2=5^2-(-3)^2=25-9=16\\\\x^2-y^2=0,1^2-0,2^2=0,01-0,04=-0,03[/tex]
[tex]241.\\1)\ b+c\\\\2)\ 5mn^3\\\\3)\ (a+9p)^2\\\\4)\ (3d)^2-(7t)^2[/tex]
[tex]242.\\1)\ p-7\\\\2)\ \frac{a+c}{d}\\\\3)\ a+mn[/tex]
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[tex]240.\\1)\\b^2-4b=(-2)^2-4\cdot(-2)=4+8=12\\\\b^2-4b=0,5^2-4\cdot 0,5=0,25-2=-1,75\\\\\\2)\\x^2-y^2=5^2-(-3)^2=25-9=16\\\\x^2-y^2=0,1^2-0,2^2=0,01-0,04=-0,03[/tex]
[tex]241.\\1)\ b+c\\\\2)\ 5mn^3\\\\3)\ (a+9p)^2\\\\4)\ (3d)^2-(7t)^2[/tex]
[tex]242.\\1)\ p-7\\\\2)\ \frac{a+c}{d}\\\\3)\ a+mn[/tex]