Respostas
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a) (5x²-4x+7)-(3x²+7x-1)
5x²-4x+7-3x²-7x+1
5x²-3x²-4x-7x+7+1
2x²-11x+8
b) (6x²-6x+9)-(3x²+8x-2)
6x²-6x+9-3x²-8x+2
6x²-3x²-6x-8x+9+2
3x²-14x+11
c) (7x-4y+2)-(2x-2y+5)
7x-4y+2-2x+2y-5
7x-2x-4y+2y+2-5
5x-2y-3
d) (4x-y-1)-(9x+y+3)
4x-y-1-9x-y-3
4x-9x-y-y-1-3
-5x-2y-4
e) (2a²-3^a+6)-(-4a²-5^a+6)
2a² -3^a+6 +4a²+5^a-6
2a²+4a²-3^a+5^a +6-6
6a²+2^a
f) (4x³-6x²+3x)-(7x³-6x²+8x)
4x³-6x²+3x-7x³+6x²-8x
4x³-7x³-6x²+6x²+3x-8x
-3x³-5x
g) (x²-5x+3)-(4x²+6)
x²-5x+3-4x²-6
x²-4x²-5x+3-6
-3x²5x-3
h) (x²+2xy+y²)-(y²+x²+2xy)
x²+2xy+y²-y²-x²-2xy
x²-x²+2xy-2xy+y²-y²
=0
i) (7ab+4c-3a)-(5c+4a-10)
7ab+4c-3a-5c-4a+10
7ab+4c-5c-3a-4a+10
7ab-c-7a+10
5x²-4x+7-3x²-7x+1
5x²-3x²-4x-7x+7+1
2x²-11x+8
b) (6x²-6x+9)-(3x²+8x-2)
6x²-6x+9-3x²-8x+2
6x²-3x²-6x-8x+9+2
3x²-14x+11
c) (7x-4y+2)-(2x-2y+5)
7x-4y+2-2x+2y-5
7x-2x-4y+2y+2-5
5x-2y-3
d) (4x-y-1)-(9x+y+3)
4x-y-1-9x-y-3
4x-9x-y-y-1-3
-5x-2y-4
e) (2a²-3^a+6)-(-4a²-5^a+6)
2a² -3^a+6 +4a²+5^a-6
2a²+4a²-3^a+5^a +6-6
6a²+2^a
f) (4x³-6x²+3x)-(7x³-6x²+8x)
4x³-6x²+3x-7x³+6x²-8x
4x³-7x³-6x²+6x²+3x-8x
-3x³-5x
g) (x²-5x+3)-(4x²+6)
x²-5x+3-4x²-6
x²-4x²-5x+3-6
-3x²5x-3
h) (x²+2xy+y²)-(y²+x²+2xy)
x²+2xy+y²-y²-x²-2xy
x²-x²+2xy-2xy+y²-y²
=0
i) (7ab+4c-3a)-(5c+4a-10)
7ab+4c-3a-5c-4a+10
7ab+4c-5c-3a-4a+10
7ab-c-7a+10
edson278:
obrigado pela sua ajuda
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