Ответ:
1) x²+25-10x-25
x²-10x
2) 6y+y²+9-6y
y²+9
3) 4a²+25b²-20ab-(4a²+25b²+20ab)
4a²+25b²-20ab-4a²-25b²-20ab
-40ab
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Ответ:
1) x²+25-10x-25
x²-10x
2) 6y+y²+9-6y
y²+9
3) 4a²+25b²-20ab-(4a²+25b²+20ab)
4a²+25b²-20ab-4a²-25b²-20ab
-40ab