A)X X(  2012) 2013 X2012

bài 3. - DE KIEM TRA TIET 21 DAI SO
DE KIEM TRA TIET 21 DAI SO

Bài 3. Tìm x, biết :

a)

x x(2012) 2013x2012.2013 0

b) 12x(3 – 4x) + 7(4x – 3) = 0

c) (x + 2)(x

2

– 2x + 4) + x(5 – x)(x + 5) = -17

d) 9x

2

– 4 – 2(3x – 2)

2

= 0