50, 505, 5050 , 50505, 505050 , 5050505 , 505050505
3865+7428=11293
12020-8350=3670
8036-4018=4018
1200-486=714
Метр, секунды, грамм, метр в 3
<span> а) 2 3/4t -1 7/8t=(2 6\8-1 7\8)*t=(1 14\8-1 7\8)*t=7\8t
б) 5/18x+(5/12x-1/4x) =5\18x+(5\12-3\12)*x=5\18x+2\12x=5\18x+1\6x=(5\18+3\18)*x=
=8\18x=4\9x
в) 11/18n-(5/18n+1/6n)=11\18n-(5\18+3\18)*n=11\18n-8\18n=(11\18-8\18)*n=3\18n=1\6n
г) 2/3c+1/9c - 7/9c =(6\9+1\9-7\9)*c=0
д) R-1/7R=(1-1\7)*R=(7\7-1\7)*R=6\7R
е)3/11y+8/11y =(3\11+8\11)*y=11\11y=y
ж) 3/5b+b =(3\5+1)*b=(3\5+5\5)*b=8\5b=1 3\5b</span>
<span> (6−y)2+12y = 12 - 2y + 12y = 12 + 10y</span>