Question

Определите х (икс) в следующих пропорциях. Помогите прошу!

Answer 1

3)4х*4.5=5*3.6
х=5*3.6/4.5*4=1
4)3х*20.4=5.1*13.2
х=5.1*13.2/20.4*3=1.1

Answer 2

3)
4x/5 = 3.6/4.5 = 36/45 =4*9 / 5*9 = 4/5
4/5 *x = 4/5
x =4/5 *5/4 =1
x =1
4)
20.4/13.2 = 5.1/3x
17/11 = 17/10x
x = 17/10 *11/17 =11/10 = 1.1
x =1.1