1) y' = (2tg(3x-1))' = 2 / cos²(3x-1) * (3x-1)' = 6 / cos²(3x-1)
2) y' = ((2x-5)*√x)' = (2x-5)'*√x + (2x-5)*(√x)' = 2√x + (2x-5) / 2√x
3) y' = ((7-3x³)^7)' = 7(7-3x³)^6 * (7-3x³)' = 7(7-3x³)^6 * (-9x²) = -63x²(7-x³)^6
4) y' = (3ctg(2x+3))' = -3 / sin²(2x+3) * (2x+3)' = -6 / sin²(2x+3)
10:2 ->5×2 10×2 20:2
2×6 ->12:2 6:2 3×2
2×8 ->16:2 8:2 4×2
В) 26(х+427)= 15756
х+427=15756÷26
х+427=606
х=606-427 -4х
х=179
е) 23154-4х=7518
4х=23154-7518
4х=15636
х=3909
105 дм2=0,1 куб×105
300 дм2=0,1 кубх300))