初中数学题,求过程答案
2个回答
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解:3AC=2AB
AC=2/3AB
CB=AB-AC
=1/3AB
D是AB中点
AD=DB=1/2AB
E是CB中点
EB=CE=1/2BC
(1) DE=DB-EB
=1/2AB-1/2CB
=1/2AB-1/2*(1/3AB)
=1/3AB
AB=3DE
=3*6
=18
(2) AD:CB=(1/2AB):(1/3AB)=3:2
AC=2/3AB
CB=AB-AC
=1/3AB
D是AB中点
AD=DB=1/2AB
E是CB中点
EB=CE=1/2BC
(1) DE=DB-EB
=1/2AB-1/2CB
=1/2AB-1/2*(1/3AB)
=1/3AB
AB=3DE
=3*6
=18
(2) AD:CB=(1/2AB):(1/3AB)=3:2
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