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7a-(4b-(2a+3b)) + (-8a+5b) =
=7a-(4b-2a-3b)-8a+5b=
=7a-(b-2a)-8a+5b=
=7a-b+2a-8a+5b=
=a+4b
b)
(3x+y) + ((2x-5y)-(x+3y))-(4x-3y)=
=3x+y+(2x-5y-x-3y-4x+3y)=
=3x+y+2x-5y-x-3y-4x+3y=
=-4y
2.
a)
3x-5-2x+2-5x-4 dla x=-3
-4x-7 = -4*(-3)-7=12-7=5
b)
2x²-4x+7+x²-5x-8 dla x= -1
3x²-9x-1 = 3* (-1)²-9*(-1)-1=3+9-1=11
c)
4a+3b-2-6a+b-3 dla a= -2, dla b=-1
-2a+4b-5 = -2*(-2)+4*(-1)-5=4-4-5=-5
b)(3x+y) + ((2x-5y)-(x+3y))-(4x-3y) = 3x+y+(2x-5y-x-3y-4x+3y) = 3x+y+2x-5y-x-3y-4x+3y = -4y
2.a) 3x - 5 - 2x + 2 - 5x -4 dla x=-3
-4x -7 ; -4*(-3) - 7 = 12-7 =5
b) 2x² - 4x + 7 + x² - 5x - 8 dla x= -1
3x^2 - 9x -1 ; 3*((-1^2)) - 9*(-1) -1 = 3*1 +9 - 1 = 3 +8 = 11
c) 4a + 3b - 2 - 6a + b - 3 dla a= -2, dla b=-1
-2a +4b -5 ; -2*(-2) + 4*(-1) -5 = 4-4-5 = -5