Question

решите уравнения



39+490:к+=46


(25-а)*7=63

Answer 1

2)175-7a=63; -7a=63-175; -7a=-112; 7a=112; a=16

Answer 2

39+490:к=46
490:к=46-39
490:к=7
х=490:7
х=70

(25-а)*7=63
175-7а=63
7а=175-63
7а=112
а=112:7
а=16