如果la-2l+lb-3l=0,则2a+b分之a+b=
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如果la-2l+lb-3l=0,则2a+b分之a+b=
如果la-2l+lb-3l=0,则2a+b分之a+b=
如果la-2l+lb-3l=0,则2a+b分之a+b=
la-2l+lb-3l=0
a-2=0,b-3=0
a=2,b=3
2a+b分之a+b
=(2+3)/(2*2+3)
=5/7
5/9
解得:a=2,b=3,所有,2a+b分之a+b=5/7
∵la-2l+lb-3l=0
且la-2l≥0,lb-3l≥0
且la-2l+lb-3l=0
∴la-2l=0 lb-3l=0(绝对值的非负性)
∴a=2,b=3
带入2a+b/a+b
=(2×2+3)/2+3
=7/5
所以2a+b/a+b=7/5
望采纳,谢谢楼主!
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