Question

реши уравнение 63*(80-а) =693 (х+420): 8=56

Answer 1

63*(80-а) = 693
80-а = 693:63
80-а = 11
-а = 11-80
-а = -69
а = 69

(х+420) : 8 = 56
х + 420 = 56*8
х + 420 = 448
х = 448-420
х = 28