help me 十万火急1)已知:a,b,c是三角形ABC的三条边,并且满足a^2+b^2+c^2-ab-ac-bc=0.求证:三角形ABC是等边三角形(请写出解答过程)
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helpme十万火急1)已知:a,b,c是三角形ABC的三条边,并且满足a^2+b^2+c^2-ab-ac-bc=0.求证:三角形ABC是等边三角形(请写出解答过程)helpme十万火急1)已知:a,
help me 十万火急1)已知:a,b,c是三角形ABC的三条边,并且满足a^2+b^2+c^2-ab-ac-bc=0.求证:三角形ABC是等边三角形(请写出解答过程)
help me 十万火急
1)已知:a,b,c是三角形ABC的三条边,并且满足a^2+b^2+c^2-ab-ac-bc=0.求证:三角形ABC是等边三角形(请写出解答过程)
help me 十万火急1)已知:a,b,c是三角形ABC的三条边,并且满足a^2+b^2+c^2-ab-ac-bc=0.求证:三角形ABC是等边三角形(请写出解答过程)
方程俩边同乘以2,变为:2a^2+2b^2+2C^2-2ab-2ac-abc=0
变项为:a^2-2ab+b^2+a^2-2ac+c^2+b^2-2bc+c^2=0
套用完全平方差公式得:(a-b)^2+(a-c)^2+(b-c)^2=0
则:(a-b)^2=0,(a-c)^2=0,(b-c)^2=0
所以a-b=0,a-c=0,b-c=0
有:a=b,a=c,b=c,
所以三角形ABC是等边三角形
help me 十万火急1)已知:a,b,c是三角形ABC的三条边,并且满足a^2+b^2+c^2-ab-ac-bc=0.求证:三角形ABC是等边三角形(请写出解答过程)
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A:------------------------------?B:Yes,l often help my parents at weekends十万火急
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数学函数题``大家来共同help me.已知反比例函数y=k/2x和一次函数y=2x-1,其中一次函数图象经过(a,b),(a+1,b+k)两点(1) 求反比例函数的解析式(2) 如图(图会画吧)已知点A在第一象限,且同