已知a/2=b/3=c/4=k(k不等于0)球a²-ab+ac/a-b-c*2/a-b+c的值
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已知a/2=b/3=c/4=k(k不等于0)球a²-ab+ac/a-b-c*2/a-b+c的值
已知a/2=b/3=c/4=k(k不等于0)球a²-ab+ac/a-b-c*2/a-b+c的值
已知a/2=b/3=c/4=k(k不等于0)球a²-ab+ac/a-b-c*2/a-b+c的值
a=2k b=3k c=4k 带入题目即可求
a=2k,b=3k,c=4k
a²-ab+ac/a-b-c*2/a-b+c
=[a(a-b+c)/(a-b-c)][2/(a-b+c)]
=2a/(a-b-c)
=4k/(2k-3k-4k)
=4k/(-5k)
=-4/5