(6/5+x)-2/3=13/18
6/5 +x-2/3=13/18
x=13/18-6/5+2/3
x=65/90-108/90+60/90
x=65-108+60/90
x= 17/90
1/10, 1/9, 1/8, 1/7, 1/6, 1/5, 1/4, 1/3, 1/2. или 3/10, 7/9, 5/8, 3/7, 5/6, 3/4. все они больше 1/11
4.54*77.7-4.54*7.7+7.46*77.7-7.46*7.7=4.54*(77.7-7.7)+7.46*(77.7-7.7)=(4.54+7.46)*
*(77.7-7.7)=12*70=840