Doprowadź do najprostszej postaci: a) -x +(3x - 5) +3y= b) (5x - 3y - 1) - (5y +2x - 4)= c) 3(-5x - a + 2)= Zad 3 Doprowadź do najprostszej postaci i oblicz wartość liczbową -3(2a - b ) + 4(2a - 4b) - (-a + b -3) dla a= 1/2,b= - 2/3 Zad 4 wyłąc

a)  -x + (3x - 5) + 3y = -x + 3x - 5 + 3y = 2x + 3y - 5 b) (5x - 3y - 1) - (5y + 2x - 4) = 5x - 3y - 1 - 5y - 2x + 4 = 3x - 8y + 3 c) 3(-5x - a + 2) = -15x - 3a + 6 -3(2a - b ) + 4(2a - 4b) - (-a + b - 3) = -6a + 3b + 8a - 16b + a - b + 3 = 3a - 12b  + 3 = 3*1/2 - 12*(-2/3) + 3 = 1,5 - 5 = -3,5 a) 24x - 16y - 8 = 8(3x - 2y - 1) b) 9 - 27y + 18x = 9(1 - 3y + 2x) Pole trapezu [latex]P= frac{(a+b)h}{2}[/latex] [latex]2P= (a+b)h[/latex] [latex] frac{2P}{h}=a+b[/latex] [latex]a= frac{2P}{h} - b[/latex] a) 3(x - 5) + 2 = -(x - 1) 3x - 15 + 2 = -x + 1 4x = 14 | :4 x = 3,5 b) x/25 = 8/20 20x = 200 | :20 x = 10 c) 7/-4x+5 =6/x-2 6(-4x + 5) = 7(x - 2) 7x - 14 = -24x + 30 7x + 24x = 30 + 14 31x = 44 | : (31) x ≈ 1,42