已知x/2=y/3=z/4,求分式4x−3y+5z2x+3y=_.
问题描述:
已知
=x 2
=y 3
,求分式z 4
=______. 4x−3y+5z 2x+3y
答
设
=x 2
=y 3
=k,z 4
则x=2k,y=3k,z=4k,
∴
=4x−3y+5z 2x+3y
=4×2k−3×3k+5×4k 2×2k+3×3k
.19 13
故答案为:
.19 13