2个数学题、急、吐血跪求!1.已知x:y:z=1/2:2/3:3/4,求(1)x/x+y-z(2)x-y/y-z2.若a:b=1:根2,a:c=2:根6,计算 根2a+b+根3c/根6a+根3b+c.(/代表分号)
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![2个数学题、急、吐血跪求!1.已知x:y:z=1/2:2/3:3/4,求(1)x/x+y-z(2)x-y/y-z2.若a:b=1:根2,a:c=2:根6,计算 根2a+b+根3c/根6a+根3b+c.(/代表分号)](/uploads/image/z/13995354-66-4.jpg?t=2%E4%B8%AA%E6%95%B0%E5%AD%A6%E9%A2%98%E3%80%81%E6%80%A5%E3%80%81%E5%90%90%E8%A1%80%E8%B7%AA%E6%B1%82%211.%E5%B7%B2%E7%9F%A5x%3Ay%3Az%3D1%2F2%3A2%2F3%3A3%2F4%2C%E6%B1%82%281%29x%2Fx%2By-z%282%29x-y%2Fy-z2.%E8%8B%A5a%3Ab%3D1%3A%E6%A0%B92%2Ca%3Ac%3D2%3A%E6%A0%B96%2C%E8%AE%A1%E7%AE%97+%E6%A0%B92a%2Bb%2B%E6%A0%B93c%2F%E6%A0%B96a%2B%E6%A0%B93b%2Bc.%EF%BC%88%2F%E4%BB%A3%E8%A1%A8%E5%88%86%E5%8F%B7%EF%BC%89)
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2个数学题、急、吐血跪求!1.已知x:y:z=1/2:2/3:3/4,求(1)x/x+y-z(2)x-y/y-z2.若a:b=1:根2,a:c=2:根6,计算 根2a+b+根3c/根6a+根3b+c.(/代表分号)
2个数学题、急、吐血跪求!
1.已知x:y:z=1/2:2/3:3/4,求(1)x/x+y-z(2)x-y/y-z
2.若a:b=1:根2,a:c=2:根6,计算 根2a+b+根3c/根6a+根3b+c.
(/代表分号)
2个数学题、急、吐血跪求!1.已知x:y:z=1/2:2/3:3/4,求(1)x/x+y-z(2)x-y/y-z2.若a:b=1:根2,a:c=2:根6,计算 根2a+b+根3c/根6a+根3b+c.(/代表分号)
1.
(x+y-z)/x=(1/2+2/3+3/4)/(1/2)
=23/12/(1/2)
=23/6
所以x/(x+y-z)=6/23
(x-y)/(y-z)
=(1/2-2/3)/(2/3-3/4)
=(2/6)/1/12
=4
2.
a:c=1:(1/2*根6)
所以a:b:c=1:根2:(1/2*根6)
2a+b+根3c/根6a+根3b+c
=(2+根2+3根2/2)/(根6+根6+1/2*根6)
=(4+5根2)/5根6
x:y:z=6:8:9
令x=6则y=8 z=9
所以x/(x+y-z)=6/5
(x-y)/(y-z)=2
令a=2 则b=2根2 c=根6
(根2a+b+根3c)/(根6a+根3b+c)=……