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A. 5x²+x+1-(x²+2x+4)
5x²+x+1-x²-2x-4
5x²-x²+x-2x+1-4 =5-2-3
B. 7a²+2a-5-(6a²-5a+3)
7a²+2a-5-6a²+5a-3
7a²-6a²+2a+5a-5-3= a²+7a-8
C. p-1-(3p+3)
p-1-3p-3
p-3p-1-3= -3-4
D. 5x-15-(9x+18)
5x-15-9x-18
5x-9x-15-18= -4x-33
3.
A. 2x+8-3x-7
2x-3x+8-7
-x+1
B. 24x-12-20x+25
24x-20x-12+25
4x+13
C. 2x-6-8x-4
2x-8x-6-4
-6x-10
maaf ya kalo salah&maaf cuma 2 nomor doang...;)