1/3y + 5/9y = 7,2;
8/9y = 7 2/10;
<span>y = 7 2/10 ÷ 8/9
y= 72/10 * 9/8
y=81/10
y=8,1</span>
Х+х+(х+1.1)=19.7
2х+х+1.1=19.7
3х+1.1=19.7
3х=19.7-1.1
3х=18.6
х=18.6/3
х=6.2
18 1/33 - 3 9/13 = 595/33 - 48/13 = 547/20 = 27 7/20
1) 12*341=4092
2) 4092+2267=6359
3) 202*6359=1284518
4) 1284518-30202=1254316.