Question

Найдите х в пропорциях 1) 2/3=х+1/7,5
2) 2/9=7/4х+3,5

Answer 1

1)2/3=x+1/7,5

3(x+1)=7,5*2

3x+3=15

3x=15-3

x=4

2)2/9=7/4x+3,5

2(4x+3,5)=63

8x+7=63

8x=56

X=7