1.
а)
(х-4)(х+1)(х+3) = 0,
х-4 = 0, х+1 = 0, х+3 = 0,
х₁ = 4 х₂ = -1, х₃ = -3,
в)
х(0,1х+2)(10х-1) = 0,
х₁ = 0, 0,1х + 2 = 0, 10х-1 = 0,
0,1х = -2, 10х = 1,
х₂ = -20, х₃ = 0,1,
с)
3у(10-у)(2у+1) = 0,
3у = 0, 10-у = 0, 2у+1 = 0,
у₁ = 0, у₂ = 10, 2у = -1,
у₃ = -1/2 (или -0,5),
2.
2 - 1 1/2t² = 0,
1 1/2t² = 2,
3/2t² = 2,
t² = 2 : 3/2,
t² = 2 * 2/3,
t² = 4/3,
t = +/-√4/3,
t₁ = 2/√3, t₂ = -2/√3