Решите уравнения:10к-к=702 , 4j+5j+j=1200 , 6t+3t-t=6400 с проверкой
1) 10к-к=702 9к=702 к=78 k=702:9=78 2)4j+5j+J=1200 10j=1200 j=120 j=1200:10=120 3)6t+3t-t=6400 8t=6400 t=800 t=6400:8=800