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Toán Lớp 8: Giúp mình với!!!!!!!! $CMR:(a+b+c)^{2}+(b+c-a)^{2}+(c+a-b)^{2}+(a+b-c)^{2}=4(a^{2}+b^{2}+c^{2})$

Home/ Toán Lớp 8: Giúp mình với!!!!!!!! $CMR:(a+b+c)^{2}+(b+c-a)^{2}+(c+a-b)^{2}+(a+b-c)^{2}=4(a^{2}+b^{2}+c^{2})$

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