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hoangkimoanh
2 năm trước
Bài 1: tìm x c,(x +3) ^3 - x(x-3) (x+3) = -9 d, 4(x +1 ) ^2 + ( 2x-1 ) ^2 - 8 (x-1) (x+1) =11 Bài 2: Cho a^2 - b^2 = 4c^2 . Chứng minh (5a-3b +8c) ( 5a-3b - 8c) = ( 3a- 5b) ^2
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