(x+2)(4x-5)=-34x²-5x+8x-10+3=04x²+3x-7=0D=3²-4*(-7)*4=9+112=121x(1) = -3+√121/2*4 = -3+11/8 = 8/8 = 1x(2) = -3-√121/2*4 = -3-11/8 = - 14/8 = -7/4 Ответ: - 7/4; 1.3/4x²-2/5x=4/5x²+3/4 x≠0 3/4x²-2/5x-4/5x²-3/4=0 (15-8x-16-15x²)/20x²=0(-1-8x-15x²)/20x²=0-1-8x-15x²=0 |*(-1)1+8x+15x²=0D=8²-4*15=64-60=4x(1) = -8+√4/15*2 = -8+2/30 = -6/30 = -1/5 x(2) = -8-√4/15*2 = -8-2/30 = -10/30 = -1/3Ответ: - 1/5; -1/3.