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vubichngoc696
2 năm trước
Bài 7. Rút gọn các biểu thức sau: a) M= (2a + b)² – (b – 2a)²; b) N= (3a + 2)² + 2(2 + 3a)(1 – 26) + (2b -1)². giúp vứi làm ơn , cần gấp :<
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