在下列各題中,他應付多少(展開)....

2008-07-17 11:47 pm
1.
x以每枝$(x+2)買了(x+2)枝花

2.
y以每枝$(x-3)買了(x+3)枝花

回答 (3)

2008-07-18 7:06 am
1.(x+2)^2
=x^2+4x+4
2.(x-3)^2
=x^2-6x+9
參考: me
2008-07-18 6:21 am
1.x應付﹕
$(x+2)(x+2)
=$(x sq.+4x+4)

2.y應付﹕
$(x-3)(x+3)
=$[x sq.+3x-(3x+3)]
=$(x sq.-3)
2008-07-17 11:59 pm
1.
他應付=(x+2)(x+2)=x^2+4x+4
2.
他應付=(x+3)(x-3)=x^2-9


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