Света - 4+2, 3+3, 1+5, 1+2, 2+1, 5+1, 2+4
12 : ( 1/2 + 1/2 + 1/2 + 1/2 ) = 12 : ( 4 * ( 1/2 )) = 12 : 2 = 6
( 2/7 + 2/7 + 2/7 + 2/7 ) * 21/8 = ( 4 * ( 2/7 )) * 21/8 = 8/7 * 21/8 = 21/7 = 3
7.8x-2.25=2.7-10.6
7.8x=2.7-10.6+2.25
7.8x=-5.65
x=-(5.65/7.8)
Сначяла мы 17 на 10 и 7 потом 11 на 10 и 1 а потом 15 на 10 и 5
250 - 3y = 115
-3y=115-250
-3y=-135
y=(-135)/(-3)
y=45