Giải các ptr sau
a, 10x2 + 17x + 3 = 2( 2x - 1 ) - 15
b, x2 + 7x - 3 = x( x - 1 ) - 1
c, 2x2 - 5x - 3 = (x + 1)(x - 1) + 3
d, 5x2 - x - 3 = 2x( x - 1) - 1 + x2
e, -6x2 + x - 3 = -3x( x - 1) -11
f, -4x2 + x ( x - 1) - 3 = x( x + 3 ) + 5
g, x2 - x - 3( 2x + 3 ) = -x( x - 2) - 1
h, -x2 - 4x - 3( 2x - 7 ) = -2x( x + 2 ) - 7
i, 8x2 - x - 3x( 2x - 3 ) = -x( x - 2 )
k, 3( 2x + 3 ) = -x( x - 2 ) -1