已知x/3=y/4=z/5,求2x-3y+5z/3x-2y+z的值
问题描述:
已知x/3=y/4=z/5,求2x-3y+5z/3x-2y+z的值
答
x/3=y/4=z/5
y=4x/3 z=5x/3
(2x-3y+5z)/(3x-2y+z)
=(2x-4x+25x/3)/(3x-8x/3+5x/3)
=19x/3 ÷(2x)
=19/6