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(n) машин грузоподъемностью (g)
причем (n > 5)
масса перевезенного груза = n*g
1) n*g = (n-3)(g+1)
2) n*g = (n-5)(g+2)
(g+1)*(n-3) = (g+2)*(n-5)
g*n - 3g + n -3 = g*n - 5g + 2n - 10
2g + 7 = n
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(2g + 7)*g = (2g + 7-3)(g + 1)
2g² + 7g = 2g² + 6g + 4
g = 4
n = 8+7 = 15
n*g = 4*15 = 60
1 3/4 = 7/4
2 4/5 = 14/5
7/4 + 14/5 = 35/20 + 56/20 = 91/20
91/20 * 30/1 =(91*3)/2 =273/2 = 136 1/2
<span>(√13-√6)(√13+√6) = 7</span>