165 × a + 533 × b
a = 30/b = 12
165 × 30 + 533 × 12 = 4950 + 6396 = 11346
a = 206/b = 80
165 × 206 + 533 × 80 = 33990 + 42640 = 76630
1)f'(x)=-sinx(5-x²)+cosx*(-2x)=-sinx(5-x²)-2xcosx
2)f'(x)= 1*sinx-(x+2)*cosx/sin²x=sinx-(x+2)cosx/sin²x
3)f'(x)=10x(x+4)-(5x²-1)/(x+4)² =10x²+40x-5x²+1/(x+4)² = 5x²+40x+1/<span>(x+4)²
4)f'(x)= 8*(3x^5 -2)^7 * 15x^4
5)f'(x)= -sin5x * 5</span>