x-3y=0,求2X+5Y\3X-2Y

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x-3y=0,求2X+5Y\3X-2Yx-3y=0,求2X+5Y\3X-2Yx-3y=0,求2X+5Y\3X-2Yx=3y所以原式=11y/7y=11/7

x-3y=0,求2X+5Y\3X-2Y
x-3y=0,求2X+5Y\3X-2Y

x-3y=0,求2X+5Y\3X-2Y
x=3y
所以原式=11y/7y=11/7