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$1) - \frac{5}{14} *0.7+2 = - \frac{5*7}{14*10} + 2 = - \frac{1}{4} + 2 = 1 \frac{3}{4} = 1.75 \\ \\ 2) \frac{3^{-6}*9}{3^{-5}} = \frac{3^{-6}*3^2}{3^{-5}} = 3^{-6+2-(-5)} = 3^{-4+5} = 3 \\ \\ 3)(2x-3)^2 = (3x+1)^2 \\ 4x^2-12x+9= 9x^2+6x+1 \\ -5x^2-18x+8 = 0 \\ 5x^2+18x-8=0 \\ D=324-4*5*(-8) = 484 \\ \sqrt{D} =22 \\ x_1 = \frac{-18-22}{10} =-4 \\ x_2 = \frac{-18+22}{10} = 0.4 \\ OTBET:-4;0.4 \\ \\ 4)2 (3\sqrt{x} -5x)+3(7x-2 \sqrt{x} )=6 \sqrt{x} -10x+21x-6 \sqrt{x} =11x \\ 11x=11*0.0025 = 0.0275$