ppII第一套一道数学题求解

xiaoshangUID: 3686317

The length of rectangle B is 10 percent less than the length of rectangle A,and the width of rectangle B is 10 percent greater than the width of rectangle A
Quantity A: the area of rectangle A
Quantity B: the area of rectangle B

感觉不难，但是我怎么算都是相等的啊，求解答

hxb1014UID: 3656704

We denote the length of rectangle A by l, and the width by w. Then A = wl , B = w(1 + 10%) l(1 -10%) = 1.1 x 0.9 wl = 0.99A < A, hence we choose B

hxb1014UID: 3656704

We denote the length of rectangle A by l, and the width by w. Then A = wl , B = w(1 + 10%) l(1 -10%) = 1.1 x 0.9 wl = 0.99A < A, hence we choose B

xiaoshangUID: 3686317

hxb1014 发表于 2016-8-16 11:06
We denote the length of rectangle A by l, and the width by w. Then A = wl , B = w(1 + 10%) l(1 -10%) ...

谢谢谢谢，懂了，是我自己没转过弯来

xiaoshangUID: 3686317

hxb1014 发表于 2016-8-16 11:06
We denote the length of rectangle A by l, and the width by w. Then A = wl , B = w(1 + 10%) l(1 -10%) ...

谢谢谢谢，懂了，是我自己没转过弯来