搜搜做题作业网GMAT数学题求教 （貌似要解1元2次方程）
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GMAT数学题求教 （貌似要解1元2次方程）
The figure shows a square patio surrounded by a walkway of width x meters. If the area of the walkway is 132 square meters and the width of the patio is 5 meters greater than the width of the walkway, what is the area of the patio, in square meters?
A.\x0556
B.\x0564
C.\x0568
D.\x0581
E.\x05100
1元2次方程不太会解了 解了半天没解出来 请说明过程 谢谢.
The figure shows a square patio surrounded by a walkway of width x meters. If the area of the walkway is 132 square meters and the width of the patio is 5 meters greater than the width of the walkway, what is the area of the patio, in square meters?
A.\x0556
B.\x0564
C.\x0568
D.\x0581
E.\x05100
1元2次方程不太会解了 解了半天没解出来 请说明过程 谢谢.
英语好有优势啊 设宽x 中间的正方形长x+5 可列出方程（2x+x+5）平方-（x+5）平方=132
化简得 2x方+5x-33=0 因式分解 （2x+11）（x-3）=0
x1=-5、5「舍去」 x2=3符合
所以小正方形边长8米
所以面积64 选b 打字不容易
化简得 2x方+5x-33=0 因式分解 （2x+11）（x-3）=0
x1=-5、5「舍去」 x2=3符合
所以小正方形边长8米
所以面积64 选b 打字不容易