两个相似三角形的一对对应边长分别是24cm和12cm．
（1）若它们的周长和是120cm，则这两个三角形的周长分别为？
（2）若它们的面积差是420cm2，则这两个三角形的面积分别为？
（1）设这两个三角形的周长分别是x、y，根据题意得
，x+y=120
=x y 24 12
解得x=80，y=40，
答：这两个三角形的周长分别是80，40；
（2）设这两个三角形的面积分别是S1、S2，根据题意得
，S1-S2=420 S1：S2=(
)224 12
解得S1=560，S2=140，
答：这两个三角形的面积分别是560，140．
The boss of an Australian restaurant is tired of the waste left by customers. He has required them to eat on their plates or they’ll be fined and won’t be allowed to next time. Chef Yukako Ichikawa has introduced a 30 percent discount for customers who eat all the food they have ordered at Wafu, her restaurant which is not far from Sydney. "To contribute to a future which can continue to develop, we require a little of our guests than most other restaurants," she says and she has put up a list of her rules on the door to the restaurant . This list includes finishing all dishes ordered which are free of milk, sugar and eggs and the cook and all her workers tell people who don't their plates to choose restaurant next time. " your meal means that everything is eaten lemon slices, ginger(生姜) and wasabi," says the menu. "Please also pay attention to that vegetables and salad on the are not decorations（装饰品）; they are of the meal too." Wafu's strict rules have been by some but against by some reviewers. Ichikawa insists on it. "Wafu is not just a restaurant; it is also the of Yukako's personal qualities ," says a statement on the restaurant's website. “We not only serve meals and respect the body prevent waste. We have to protect the environment and keep the healthy development of our earth.”
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