Rút gọn

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IBIVN
1, Ruit gon
9₁ (4x-1)² - (2x + 5)² - (3x-3) (2x + 3)
a
2
b₁ (2x + 3 ) ² + 2 ( 2x + 3) (2x - 3) + (2x-3) ²
2
4, (5x + y)² = (2x - 1)² + (3x - 1) (1 + 3x) - 4(x-2)
2
2, Tim x
a, (x-3)² - 445
2
b₁ (x-4) ²- (x-2) (x + 3) = 5 ( x-6) ₁₁ ) (7 ~ )..
3. CMR N = (6n+ 1)(n+ 5) - (3n+ 5) (2n-1) : 2 (thez)
Bailm
4
a₁ (4x-1)² = (2x + 5)² - (2x-3)(2x+3)