Question

Ex 8, 9 , 10 , 11

DAU COROANA !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Va rog repede

Answer 1

8) $\left \{ {{7ab-7ac=105} \atop {a=5}} \right.$   ⇔   $\left \{ {{35b-35c=105} \atop {a=5}} \right.$    ⇒     $\left \{ {{b-c=3} \atop {a=5}} \right.$
10 a) 0.14