Question

помогите пж.очень надо умоляю вас помогите​

Answer 1

$left { {{frac{2z}{3}*12-frac{5v}{4}*12=-3*12} atop {frac{5z}{6}*24+frac{7v}{8}*24=6*24}} right.\\left { {{8z-15v=-36} atop {20z+21v=144}} right.\\left { {{z=frac{15v-36}{8} } atop {20*frac{15v-36}{8}+21v=144 }} right.\\left { {{z=frac{15v-36}{8} } atop {37,5v-90+21v=144}} right.$

$left { {{z=frac{15v-36}{8} } atop {58,5v=234}} right.\\left { {{v=4} atop {z=frac{15*4-36}{8} }} right.\\left { {{z=3} atop {v=4}} right.\\Otvet:boxed{z=3;v=4}$