一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值
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一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值一只x/3=y/4=z/5,求x+y+z/x及x+y+z
一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值
一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值
一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值
令a=x/3=y/4=z/5
x=3a,y=4a,z=5a
所以x+y+z/x
=3a+4a+5a/3a
=12a/3a
=4
x+y+z/x-y+z
=3a+4a+5a/3a-4a+5a
=12a/4a
=3
用Y和Z表示X，代进去就好了
应该是把y和z用x表示出来
y=4x/3
z=5x/3
一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值
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