一條超簡單的數
回答 (2)
2006-10-20 2:38 am
✔ 最佳答案
x(x+5)=36 和 (x+5)x=36 they are the same, just solve x(x+5)=36
x(x+5)=36
x^2+5x=36
x^2+5x-36=0
(x+9)(x-4)=0
x=4 or x=-9
2006-10-19 18:39:26 補充：
the solution of (x 5)x=36 is also x=4 or x=-9
2006-10-20 2:38 am
x(x+5)=36
x^2+5x-36=0
(x+9)(x-4)=0
x=-9(捨去)或x=4
x=4
(x+5)x=36(同上)
2006-10-19 18:39:55 補充：
更正當x要係正數x=-9 先至要捨去不好意思
x^2+5x-36=0
(x+9)(x-4)=0
x=-9(捨去)或x=4
x=4
(x+5)x=36(同上)
2006-10-19 18:39:55 補充：
更正當x要係正數x=-9 先至要捨去不好意思
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