Решение уравнения х*15,2=9,12; 19,83+х=138,16; х-54,81=19,98; х: 7,8=15,2.

Х×15.2=9.12
х=9.12:15.2
х=0.6
0.6×15.2=9.12

19.83+х=138.16
х=138.16-19.83
х=118.33
19.83+118.33=138.16

х-54.81=19.98
х=19.98+54.81
х=74.79
74.79-54.81=19.98

х÷7.8=15.2
х= 15.2×7.8
х=118.56
118.56÷7.8=15.2