Question

Решите пж побыстрее

Answer 1

№1
1) (5+a)/2a² + (1-2a)/a = 5+a+2a(1-2a)/2a²= 5+a+2a-4a²/2a²= -4a²+3a+5/2a²
2) (4x+8)/12x³ * 3x/(x+2) = 4(x+2)/4x² * 1/(x+2) = 1/x²
3) (m+n)² * 8m/(m²-n²) = (m+n)² * 8m/(m-n)(m+n) = (m+n) * 8m/(m-n) = (8m²+8mn)/(m-n)

№2
3/y - (y²-9)/y³ * y/(3+y) = 3/y - (y-3)(y+3)/y² * 1/(3+y) = 3/y - (y-3)/y² = (3y-y+3)/y² = 2y+3/y^2

№3
(b²-8b+16)/(2b+6) : (b²-16)/(4b+12) = (b-4)²/(2b+6) * (4b+12) / (b²-16) = (b-4)²/(2b+6) * 2(2b+6)/(b-4)(b+4) = (b-4)* 2/(b+4) = (2b-8)/(b+4)
При b=2.4
(2b-8) / (b+4) = 2*2.4-8/2.4+4 = -3.2/6.4 = -1/2