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由x+y=8m 1式x-y=2m 2式得1式+2式=x+y+x-y=8m+2m =2x=10m =x=5m把5m代入x+y=8m或x-y=2m得y=3m又有2x-5y=1轉化為10m-15m=1 -5m=1 m=-…
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