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数学
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如图,M、N为线段AB上两点,且AM:MB=1:3,AN:NB=5:7.若MN=2,求AB的长.
人气:261 ℃ 时间:2019-09-26 15:39:02
解答
设AM=x,MB=3x,则AN=
5
12
×(1+3)x=
5
3
x,
5
3
x−x=2,x=3
,
5
3
x-x=2,
解得x=3.
则AB=4x=12.
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