Witaj! Oto odpowiedź:
[tex]3x + 2 + 5x + 3\\x = -1\\3x + 2 + 5x + 3= 8x + 5 = 8 * ( -1 ) + 5 = -8 + 5 = -3 \\x - (x - y)\\x = 20 , y = -10\\x - (x - y) = x - x + y = y = - 10\\(2a^{2} - 3ab) - (b^{2} - 3ab + a^{2} )\\a=2,b=-3\\(2a^{2} - 3ab) - (b^{2} - 3ab + a^{2} )= 2a^{2} - 3ab - b^{2} + 3ab - a^{2}=a^{2} -b^{2} =2^2-(-3)^2=4-9=-5\\3x(-2 + 3x)\\x=-1\\3x(-2 + 3x)=-6x+9x^2=-6*-1+9*(-1)^2=6+9=15\\3(-a + 4) - 1/2(6 - 2a)\\a=-2\\3(-a + 4) - 1/2(6 - 2a)=-3a+12-3+a=-2a+9=-2*-2+9=4+9=13\\[/tex]
[tex]12 * 3x + 12/6 - 8 * 6x - 1/2\\x=2\\12 * 3x + 12/6 - 8 * 6x - 1/2=36x+2-48x=-12x+2=-12*2+2=-24+2=-22\\6a + 18b/3 + -12a + 16/4\\x=-5,b=1/3\\6a + 18b/3 + -12a + 16/4=6a+6b-12a+4=-6a+6b+4=-6*-5+6*1/3+4=30+2+4=36\\2/5y (0,5y -20)\\y=5\\2/5y (0,5y -20)=1,25y^2-50y=1,25*5^2-50*5=31,25-250=-218,75[/tex]
Miłego dnia/wieczora życzę :)
