(6 3/8 - 2 3/4) * (- 4) + 7/18 * 9 = - 11
1) 6 3/8 - 2 3/4 = 6 3/8 - 2 6/8 = 5 11/8 - 2 6/8 = 3 5/8
2) 3 5/8 * (- 4) = 29/8 * (- 4) = - 29/2 = - 14 1/2
3) 7/18 * 9 = 7/2 = 3 1/2
4) - 14 1/2 + 3 1/2 = - 11
Сразу можно подставить а
(√5+4)²-6√5 * (√5+4) - 1=
5+8√5 + 16 - 7√5 -10√5 - 1=
20-9√5
4x+33=0
4x=-33
x=-33/4
x=-4 1/4