一个长方形的长减少5cm，宽增加2cm，就成为一个正方形，并且这两个图形的面积相等，若设这个长方形的长为xcm，宽为ycm，则可列方程组（）A.x−5＝y+2xy＝(x−5)(y+2)B.x−5＝y+22(x−5)＝5y

Question

x−5＝y+2

xy＝(x−5)(y+2)

B.

x−5＝y+2

2(x−5)＝5y

C.

x−5＝y+2

xy＝(x+5)(y+2)

D.

x+5＝y−2

xy＝(x−5)(y+2)

x−5＝y+2

xy＝(x−5)(y+2)

x−5＝y+2

xy＝(x−5)(y+2)

x−5＝y+2

xy＝(x−5)(y+2)

x−5＝y+2

xy＝(x−5)(y+2)

x−5＝y+2x−5＝y+2xy＝(x−5)(y+2)xy＝(x−5)(y+2)

x−5＝y+2

2(x−5)＝5y

C.

x−5＝y+2

xy＝(x+5)(y+2)

D.

x+5＝y−2

xy＝(x−5)(y+2)

x−5＝y+2

2(x−5)＝5y

x−5＝y+2

2(x−5)＝5y

x−5＝y+2

2(x−5)＝5y

x−5＝y+2

2(x−5)＝5y

x−5＝y+2x−5＝y+22(x−5)＝5y2(x−5)＝5y

x−5＝y+2

xy＝(x+5)(y+2)

D.

x+5＝y−2

xy＝(x−5)(y+2)

x−5＝y+2

xy＝(x+5)(y+2)

x−5＝y+2

xy＝(x+5)(y+2)

x−5＝y+2

xy＝(x+5)(y+2)

x−5＝y+2

xy＝(x+5)(y+2)

x−5＝y+2x−5＝y+2xy＝(x+5)(y+2)xy＝(x+5)(y+2)

x+5＝y−2

xy＝(x−5)(y+2)

x+5＝y−2

xy＝(x−5)(y+2)

x+5＝y−2

xy＝(x−5)(y+2)

x+5＝y−2

xy＝(x−5)(y+2)

x+5＝y−2

xy＝(x−5)(y+2)

x+5＝y−2x+5＝y−2xy＝(x−5)(y+2)xy＝(x−5)(y+2)

Answer 1

由题意，得：

x−5＝y+2

xy＝(x−5)(y+2)

．
故选A．

x−5＝y+2

xy＝(x−5)(y+2)

x−5＝y+2

xy＝(x−5)(y+2)

x−5＝y+2

xy＝(x−5)(y+2)

x−5＝y+2

xy＝(x−5)(y+2)

x−5＝y+2x−5＝y+2x−5＝y+2xy＝(x−5)(y+2)xy＝(x−5)(y+2)xy＝(x−5)(y+2)．
故选A．