1) решите уравнение 4/9x+1/3x=6,3 2)решите уравнение 1/7x+3/14x=14 3)решите уравнение 1/6x+5/12x=8,4 4)решите уравнение 1/3x+5/9x=7,2

1)
4/9х + 1/3х = 6,3
4/9х + 1*3/3*3х = 6,3
4/3х + 3/9х = 6,3
7/9х = 6,3
х = 6 3/10 : 7/9
х = 63/10 * 9 /7
х = 63*9 / 10*7
х = 567/70
х = 8,1

2)
1/7х + 3/14х = 14
1*2/7*2х + 3/14х = 14
2/14х + 3/14х = 14
5/14х = 196/14
х = 196/14 : 5/14
х = 196/14 * 14/5
х = 196 : 5
х = 39,2

3)
1/3х + 5/9х = 7,2
1*3/3*3х + 5/9х = 7 2/10
3/9х + 5/9х = 72/10
8/9х = 72/10
х = 72/10 : 8/9
х = 72/10 * 9/8
х = 648/80
х = 8,1