【单选题】A Living a healthy lifestyle lies in forming the right eating habits.Here are some of the good habits you can develop when it comes to healthy eating. Drink plenty of water. You must drink at least 8 ...
【单选题】震惊中外的“五卅”反帝爱国运动爆发的导火线是()被枪杀。
【简答题】7 A.Drink more water. B.Be on a diet. C.Quit smoking. D.Do exercises.
【简答题】如图,规格为60cm×60cm的正方形地砖在运输过程中受损,断去一角,量得AF=30cm,CE=45cm,现准备从五边形地砖ABCEF上截出一个面积为S的矩形地砖PMBN, (1)设BN=x,BM=y,请用含x的代数式表示y,并写出x的取值范围; (2)请用含x的代数式表示S,并在给定的直角坐标系内画出该函数的示意图; (3)利用函数图象回答(2)中:当x取何值时,S有最大值?最大值是多少?