Question

решите уравнения .
75+х=90, 80-к=42, 6*н=54

Answer 1

1)

х=90-75
х=15

75+15=90

2)к=80-42
к=38
80-38=42
3)н=54:6
н=9
6*9=54

Answer 2

75+x=90
x=90-75
x=15
——————
75+15=90
90=90
80-k=42
k=80-42
k=38
——————
80-38=42

6×n=54
n=54:6
n=9
—————
6×9=54