若X=-2X+3Y-Z,X-2Y+Z=0,则X比Y的值为( ) 要过程的
1个回答
X=-2X+3Y-Z(1)
0=X-2Y+Z(2)
(1)式加(2)式等于X+0=-2X+3Y-Z+X-2Y+Z即X=-X+Y所以Y=2X.所以X/Y=1/2
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