若X:Y:Z=5:6:7,那么(X+2Y+3Z):(3X+2Y+Z)等于

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若X:Y:Z=5:6:7,那么(X+2Y+3Z):(3X+2Y+Z)等于若X:Y:Z=5:6:7,那么(X+2Y+3Z):(3X+2Y+Z)等于若X:Y:Z=5:6:7,那么(X+2Y+3Z):(3X

若X:Y:Z=5:6:7,那么(X+2Y+3Z):(3X+2Y+Z)等于
若X:Y:Z=5:6:7,那么(X+2Y+3Z):(3X+2Y+Z)等于

若X:Y:Z=5:6:7,那么(X+2Y+3Z):(3X+2Y+Z)等于
38:34

(5X1+6X2+7x3):(5x3+6x2+7x1)
=38:34
=19:17.

19:17

19:17

设X为5a,Y为6a,Z为7a
(X+2Y+3Z):(3X+2Y+Z)
=(5a+2×6a+3×7a):(3×5a+2×6a+7a)
=38a:34a
=19:17