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ngohaiyen08112003
2 năm trước
Cho biểu thức: `M = (a+1)^2 + (2b+1)^2 + (3c+1)^2 + 2(2ab + 3ac + 6bc) + 2(a+2b+3c)` `N = (a+2b+3c+1)^2` Tính hiệu `M-N`
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