Question

已知x÷3＝y÷4＝z÷6,

已知三分之x＝四分之y＝六分之z,求x�0�5＋y�0�5＋z�0�5分之xy＋yz＋xz

Answer 1

令x/3=y/4=z/6=K
则x=3K,y=4K,c=6K
（xy+yz+xz）/(X2+y2+z2)
=(3K*4K+4K*6K+3K*6K)/(3K*3K+4K*4K+6K*6K)
=54K2/61K2
=54/61希望能帮到你！