Tìm x, biết: a) x = 1/5 + 2/11 b) x/5 = 5/6 + -19/30

a) x=15+211⇔x=1.11+2.555=2155

b) x5=56+−1930⇔x5=5.5+(−19)30=630=16⇔x=56