x:y:z=2:3:4 求 3x+2y-z/x+y+z 的值
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x:y:z=2:3:4求3x+2y-z/x+y+z的值x:y:z=2:3:4求3x+2y-z/x+y+z的值x:y:z=2:3:4求3x+2y-z/x+y+z的值设x=2t,则y=3t,z=4t3x+
x:y:z=2:3:4 求 3x+2y-z/x+y+z 的值
x:y:z=2:3:4 求 3x+2y-z/x+y+z 的值
x:y:z=2:3:4 求 3x+2y-z/x+y+z 的值
设x=2t,则y=3t,z=4t
3x+2y-z/x+y+z
=6t+6t-4t/2t+3t+4t
=8t/9t
=8/9
设1份为k
∴x=2k
y=3k
z=4k
把x=2k、y=3k、z=4k带入3x+2y-z/x+y+z
解原式=3×2k+2×3k-4k/2k+3k+4k
=8k/9k
=8/9
遇到比例问题一般可以设比中每一份为a,所以x=2a,y=3a,z=4a将值带进所求的式子中在消去a,算得8/7,希望能对楼主有用…
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