Odpowiedź :
Odpowiedź:
Zad. 1
Mazaki Oli: x
Mazaki Kasi: x + 5
Mazaki Jasia: x-8
Razem: [tex]x + x+5+x-8 = 3x -3[/tex]
Zad. 2
[tex]a) (3-2x)(4x-5) = 12x -15 -8x^2 +10x = -8x^2 +22x -15\\b)(5x+1)(2x+4) = 10x^2 +20x +2x +4 = 10x^2 +22x +4 \\c) (2-3x)(4+3x) = 8 +6x -12x -9x^2 = -9x^2 -6x +8\\d) (6+10x)(3-4x) = 18-24x +30x -40x^2 = -40x^2 +6x + 18\\e)(2x-1)(7x+3) = 14x^2 +6x -7x -3 = 14x^2 -x -3 \\f) (5x+4)(4x-6)= 20x^2 -30x +16x -24 = 20x^2 -14x -24\\g)(6x-2)(7x+1) = 42x^2 +6x -14x -2 = 42x^2 -8x -2[/tex]
Zad. 3
[tex]a) -2(3+5x) = -6 -10x\\b) 4(2x-6) = 8x -24\\c) 5(x^2+6x) = 5x^2 +30x\\d)7x(2+3x) = 21x^2+14x \\e)-3(2-5x) =15x -6 \\f) -7(2-4x) = 28x -14[/tex]
Odpowiedź:
Szczegółowe wyjaśnienie:
x- mazaki Oli
x+5 - mazaki Kasi
x- 8 -mazaki Jasia
x+x+5+x-8=3x-3
________________
=12x -15-8x^2+10x= -8x^2+22x-15
=10x^2+20x+2x+4=10x^2+22x+4
=8+6x-12x-9x^2=-9x^2 -6x+8
= 18-24x+30x-40x^2= -40x^2+6x+18
=14x^2-6x-7x-3=14x^2 -13x-3
=20x^2-30x+16x-24=20x^2 -14x-24
=42x^2+6x-14x-2=42x^2-8x-2
____________________
=-6-10x
=8x-24
=5x^2+30x
=14x+21x^2
=-6+15x
=14-28x