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(1 + 7x²y)²
B) 49m6 - 70am³n² + 25a²n4
(7m³ - 5an²)²
C) 121 + 198*6 + 81*12
(11 + 9*6)²
D) 16 - 104*2 + 169*4
(4 - 13*2)²