Упростите выражение : 1) (x - 4)^2 - 6
2) 10a + (a - 5)^2
3) (3m - 7n)^2 - 9m(n + 5n)
4 (6a - 3b)^2 + (9a +2b)^2
2) 10a + (a - 5)^2
3) (3m - 7n)^2 - 9m(n + 5n)
4 (6a - 3b)^2 + (9a +2b)^2
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1)x²-8x+16-6=x²-8x+102)10a+a²-10a+25=a²+25
3)9m²-42mn+49n²-54mn=9m²-96mn+49n²
4)36a²-36ab+9b²+81a²+36ab+4b²=117a²+13b²