تمارين وحلول

3 (2x-5) = 6x – 15 2x (-4x+3) = - 8x2+6x
2a(3a-5b) = 6a2 - 10ab 5a (-4a -5b) = -20a2-25ab
(2+x)(5-x) = 10 –2x +5x –x2
= 10 +3x –x2
(2x-1)(3x+2) = 6x2+4x-3x-2
= 6x2+x -2
(1-3x)(5-x) = 5 – x – 15x + 3x2
= 5– 16x + 3x2
(-2x+3)(-5x-4) = 10x2+8x-15x-12
= 10x2 – 7 x-12
( 3x - 1 ) ( 2 - 5x ) = 6x –15x2- 2 + 5x
= –15x2+ 11x- 2
3 ( 5x + 2 ) = 15x +6
(2a+b)(a+2b) = 2a2+4ab+ab+2b2
= 2a2+5ab+2b2
(5 - a)(5 - a) = 25 –5a-5a+a2
= 25 – a2
A = 2x + (2x-3) - (3x+2) - (2-3x)
A = 2x + 2x-3 – 3x - 2 – 2+3x
A = 4x - 7
B = 2x (2x-3) - (3x+2) (2-3x)
B = 4x2-6x- [ 6x-9x2+4-6x]
B = 4x2-6x - 6x+9x2-4+6x
B = 13x2 – 6x -4
C = 2x + (2x-3) (3x+2) - (2-3x)
C= 2x + 6x2 +4x –9x –6 –2 + 3x
C=6x2 -8
D = (2x-3) (2x-3) – 4x (3x+2) – 3x (-2-3x)
D = 4x2-6x-6x+9-12x2 –8x +6x+9x2
D = x2 –14x +9

c est mal organisé jamila
+1