已知x:y:z=3:4:5,x+y+z=36,则x+1/4y+z的立方根是多少
1个回答
设x=3t y=4t z=5t,则有:
3t+4t+5t=36
12t=36
t=3
x=9 y=12 z=15
x+1/4y+z=9+12/4+15=27
所以,27的立方根是3.
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