问题
填空题
已知2a=3b，则
|
答案
+a a+b
-b a-b
=a2 a2-b2
+a(a-b) a2-b2
-a(a+b) a2-b2
=a2 a2-b2
，a2 a2-b2
∴2a=3b，
∴a=
b，3 2
把a=
b代入原式=3 2
=9b2 4
-9b2 4 4b2 4
．9 5
故答案为：
．9 5
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已知2a=3b，则
|
+a a+b
-b a-b
=a2 a2-b2
+a(a-b) a2-b2
-a(a+b) a2-b2
=a2 a2-b2
，a2 a2-b2
∴2a=3b，
∴a=
b，3 2
把a=
b代入原式=3 2
=9b2 4
-9b2 4 4b2 4
．9 5
故答案为：
．9 5
| 我们班将在周三有一个志愿者活动，同学们将做些什么呢？从表格中选取适当的词语完成句子， 使句意表达完整，符合逻辑。（有多余选项，请只填写字母）
Our class is planning to do some volunteer work on Wednesday afternoon in the school. Students of the Art Club are considering (2)______ and selling them to (3)______ for the poor. The music group is going to (4)______ in school to entertain other students. Some students are going to help (5)______. They can help to put books back onto the shelves. Several students want to do some repair work to help (6)______ stuff like bikes, radios, etc. Some others will (7)______ the school garden. They think keeping the environment (8)______ is good for our health. Two boys, Michael and Jerry, are (9)______ and good at sports. They'd like to teach younger students to play sports. Though it may be (10)______, everyone in class is looking forward to it. |