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Tungbilly1097
2 năm trước
a,Chứng minh rằng a^3+b^3+c^3-3abc=(a+b+c)(a^2+b^2+c62-ab-bc-ca). Từ đó hãy cho biết mối quan hệ giữa các số a,b,c nếu a^3+b^3+c^3=3abc b,Cho a,b,c là các số thực khác 0 sao cho: a^3b^3+b^3c^3+c^3a^3=3a^2b^2c^2. Hãy tính giá trị biểu thức M=(1+a/b)(1+b/c)(1+c/a). c,Tìm số abcd biết rằng abcd+bcd+cd+d=4574
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