Упростите4(3а+1,6)-(5+2а)-3(а-1,2)-1,5(6-х)-2(-х-3)+0,9(5х-1)0,8(2у-3)+5(1,6-0,5у)-2(0,8у-1,7)5/6(1/5n+6)-2/3(9-1/2n)+5/8(4/5n-8)

Раскроем все наши скобки и упростим.

1) 4 (3а + 1,6) - (5 + 2а) - 3 (а - 1,2) = 4 * 3a + 4 * 1.6 - 5 - 2a - 3 * a + 3 * 1.2 = 12a + 6.4 - 5 - 2a - 3a + 3.6 = a (12 - 2 - 3) + 5 = 7a + 5.

2) - 1,5 (6 - х) - 2 (- х - 3) + 0,9 (5х - 1) = - 1.5 * 6 + 1.5 * x + 2 * x + 3 * 2 + 0.9 * 5x - 0.9 = - 9 + 1.5x + 2x + 6 + 4.5x - 0.9 = x (1.5 + 2 + 4.5) - 3.9 = 8x - 3.9.

3) 0,8 (2у - 3) + 5 (1,6 - 0,5у) - 2 (0,8у - 1,7) = 0.8 * 2y - 3 * 0.8 + 5 * 1.6 - 5 * 0.5y - 2 * 0.8y + 2 * 1.7 = 1.6y - 2.4 + 8 - 2.5y - 1.6y + 3.4 = y (1.6 - 2.5 - 1.6) + 9 = - 2.5y + 9.

4) 5/6 (1/5n + 6) - 2/3 (9 - 1/2n) + 5/8 (4/5n - 8) = 5/6 * 1/5n + 6 * 5/6 - 2/3 * 9 + 2/3 * 1/2n + 5/8 * 4/5n - 8 * 5/8 = 1/6n + 5 - 6 + 1/3n + 1/2n - 5 = n (1/6 + 1/3 + 1/2) - 6 = n (1/6 + 2/6 + 3/6) - 6 = n (1 + 2 + 3)/6 - 6 = 6/6n - 6 = n - 6.