j) -( 3/4x +2y) -(-1/2x -y -2) = -3/4x -2y +2/4x +y +2 = -1/4x -y +2 k) (-3/5ab +2,6a) - (-0,6ab +2i3/5a)= -3/5ab +2,6a +0,6ab -2i3/5a = 0 ( 3/5 = 6/10 = 0,6 ) l) 1 -[-4x +(3 +5x)] = 1 -[ -4x +3 +5x] = 1 +4x -3 -5x= -x -2 ł) -4 +[-3x -(-4a +2y -4)]= -4 +(-3x+4a -2y +4]= -4-3x+4a -2y +4= 4a -3x -2y m) -2,4x -[ -(x+1) + (1,4x -1)] = -2,4x -[-x-1 +1,4x -1 ]= -2,4x +x+1-1,4x +1 = -2,8x +2 n) -(3x +4y) -(-5x +7y) - (x-2y) = -3x -4y +5x -7y -x +2y= x -9y o) [ 5ab -(4a +3b)] - [-6a -(4b -5ab)] = [ 5ab-4a -3b]-[-6a -4b +5ab]= = 5ab -4a -3b +6a +4b -5ab = 2a +b p) -2/3x +( -3/5y -5/6x) = -2/3x -3/5y -5/6x = -4/6x -3/5y - 5/6x= -9/6x -3/5y r) 4/5x +[-(1/5x -1) -y-(0,4y -x)]= 4/5x +[-1/5x+1 -y -0,4y +x]=4/5x-1/5x+1-y-0,4y+x=1i3/5x -1,4y+1 s) [0,8a -(-1,2a +0,4b)] - (2a -0,3b) +0,1b = [ 0,8a +1,2a-0,4b] -2a +0,3b +0,1b= = 0,8a +1,2a -0,4b -2a +0,3b +0,1b = 2a -2a -0,4b + 0,4b = 0 t) -[ -2a -(5/8a +0,4)] - [ 2i1/2a + (1/8a -1,6) ]= -[ -2a -5/8a -0,4] -[2i1/2a +1/8a -1,6] = = 2a +5/8a +0,4 -2i4/8a -1/8a +1,6= 2i5/8a -2i5/8a +2 = 2
