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當x等於(0)這個數等於0
x^2+9x=0 x(x+9)=0 x1=0,x2=-9
原式=(2/9+7/9)+(4/7-3/7) =1-1/7 =6/7 如還有新的問題,請不要追問的形式發送,另外發問題並向我求助或在追問處發送問題連結位址,
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