Question

9/x-2 = 3/7
4/5=3x-1/0.4
Решите плиз пропорции!) Завтра КР!

Answer 1

9/x-2 = 3/7
9*7=3(х-2)
63=3х-6
57=3х
х=19

4/5=3x-1/0.4
4*0.4=5(3х-1)
1.6=15х-5
6.6=15х
х=0.44

Answer 2

9/x-2=3/7
9*7 = 3*(x-2)
63 = 3x-6
3x = 63 + 6
3x = 69
X = 23

4/5 = 3x-1/0,4
5*(3x-1) = 4*0,4
15x-5 = 1,6
15x = 1,6 + 5
15x = 6,5
X = 6,5 : 15
X = 0,43

Answer 3

во 2-ом х = 0,44