A:C3H8
B:C4H10
C:C5H12
D:C6H14
如图,△ABC中,AB=7,BC=6,AC=8,延长∠ABC、∠ACB的角平分线BD、CE分别交过点A且平行于BC的直线于N、M,BD与CE相交于点G,则△BCG与△MNG的面积之比是____.
下列计算正确的是( )