Toán Lớp 8: Các bạn giúp mình với!!!
a)Cho a²+b²+c²+3=2(a+b+c).CMR:a=b=c=1
b)Cho (a+b+c)²=3(ab+bc+ca).CMR:a=b=c
c)Cho (a-b)²+(b-c)²+(c-a)²=(a+b-2c)²+(b+c-2a)²+(c+a-2b)².CMR:a=b=c
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Toán Lớp 8: Các bạn giúp mình với!!!
a)Cho a²+b²+c²+3=2(a+b+c).CMR:a=b=c=1
b)Cho (a+b+c)²=3(ab+bc+ca).CMR:a=b=c
c)Cho (a-b)²+(b-c)²+(c-a)²=(a+b-2c)²+(b+c-2a)²+(c+a-2b)².CMR:a=b=c
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