Question

20 балов тому кто решит этот пример

Answer 1

$left { {{frac{2u}{3}-frac{5m}{4}=-3; |cdot 12} atop {frac{5u}{6}+frac{7m}{8}=6; |cdot 24}} right. ; left { {{8u-15m=-36} atop {20u+21m=144}} right. ; left { {{u=frac{15m-36}{8}} atop {20cdot frac{15m-36}{8}+21m=144}} right.\\\left { {{u=frac{15m-36}{8}} atop {37,5m-90+21m=144}} right.; left { {{u=frac{15m-36}{8}} atop {58,5m=234}} right. ; left { {{u=3} atop {m=4}} right.\\\Otvet:; ; u=3; ,; m=4; .$