Question

Уравнение х + 1 деленый на 5, + х - 1 деленый на 4 = 1

Answer 1

(Х+1)/5 + (х-1)/4 = 1
4(х+1) + 5(х-1) = 20
4х + 4 + 5х - 5 = 20
9х = 21
3х = 7
х = 7/3
х = 2целых1/3