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B) -4+[-3X-(-4a+2y-4)] = -4 -3x +4a -2y + 4 = -3x + 4a - 2y
C) -2,4x-[-(x+1)+(1,4x-1)] = -2,4x + x + 1 - 1,4x + 1 = -2,8x + 2
D) –(3x+4y)-(5x+7y)-(x-2y) = -3x - 4y - 5x - 7y - x + 2y = -9x - 9y
1-(-4x+3+5x)
1+4x-3-5x
-x-2
B) -4+[-3X-(-4a+2y-4)]
-4+( -3x+4a-2y+4)
-4-3x+4a-2y+4
-3x+4a-2y
C) -2,4x-[-(x+1)+(1,4x-1)]
-2,4x-(-x-1+1,4x-1)
-2,4x+x+1-1,4x+1
-2,8x+2
D) –(3x+4y)-(5x+7y)-(x-2y)
-3x-4y-5x-7y-x+2y
-9x-9y
E) [5ab-(4a+3b)]-[-6a-(4b-5ab)]
(5ab-4a-3b)-(-6a-4b+5ab)
5ab-4a-3b+6a+4b-5ab
2a+b
F) -2/3x+(3/5y-5/6x)
-2/3x+3/5y-5/6x
-4/6x+3/5y-5/6x
-9/6x+3/5y
1,5x+3/5y
G) 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
1,6x-1,4y+1
H) [0,8a-(-1,2a+0,4b)]-(2a-0,3b)+0,1b
0,8a+1,2a-0,4b-2a+0,3b+0,1b
wynik to zero
I) –[-2a-(5/8a+0,4)]-[2 1/2a+(1/8a-1,6)]
-( -2a-5/8a-0,4)-(2,5a+1/8a-1,6)
2a+5/8a+0,4-2,5a-1/8a+1,6
2