А) 5,04 : (104,2-х)=1,2
5,04: (104,2 - х) = 1,2 , х≠104,2





126 = 6 (521-5х)
21 = 521 - 5х
5х= 521-21
5х = 500
х=100, х ≠ 104,2
х = 100
Б) 1,2 + 4,5 - 0,7 = 1,01
5,7х - 0,7 = 1,01
5,7х = 1,01 + 0,7
5,7 х = 1,71
х = 0,3
А) 6,72: (203,2-х) = 2,1 , х≠203,2





168 = 10,5 (1016 - 5х)
168 = 10668 - 52,5 х
52,5х = 10668 - 168
52,5х = 10500
х = 200, х≠203,2
х = 200
Б) 1,3х+3,8х - 0,03 = 2, 01
5,1х - 0,03 = 2,01
5,1 = 2,01+0,03
5,1х=2,04
х=0,4