решите уравнения:10к-к=702 , 4j+5j+j=1200 , 6t+3t-t=6400

Question

решите уравнения:10к-к=702 , 4j+5j+j=1200 , 6t+3t-t=6400

Answer 1

10к-к=702

9к=702

к=702:9

к=78

4j+5j+j=1200

10j=1200

j=1200:10

j=120

6t+3t-t=6400

8t=6400

t=6400:8

t=800