Cho x3 = 3x + 1; y3 = 3y+1; z3 = 3z+1. CMR: x2 + y2 + z2 = 6
Edited by 0932032656, 25-12-2017 - 13:20.
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Posted 25-12-2017 - 21:41
Khoa Linh
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Thiếu úy
Cho x3 = 3x + 1; y3 = 3y+1; z3 = 3z+1. CMR: x2 + y2 + z2 = 6
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