a+building+block

席妻泼1242设A,B为两个任意事件,则下列结论中一定正确的是( )(注:A+B=A∪B)A.(A+B) - B=AB.A - B=AC.(A -
司芬宰19552911847 ______ 由题意可知:A+B=A∪B, (A+B)-B=A∪B-B=A-A∩B=A-AB,故选项A错误, A-B=A-A∩B=A-AB,故选项B错误, (A-B)+B=A-A∩B+B=A+B,故选项C正确, A+AB=A,故选项D错误, 综上所述,故选择:C.

席妻泼1242...1.首先我们来看一个英语表达框架: A+V+num.+times+Adj原级+than+B请问这框架怎么用德语表示?2.然后我们看一个例句: The new building is twice ... -
司芬宰19552911847 ______[答案] Das neue Gebäude ist zweimal so groß wie das alte. 由此总结:A+sein+...mal(倍数)+so +Adj.(原级)+wie+B (自己总结的...)

席妻泼1242已知实数a,b满足(a+b)(a+b)=1,(a - b)(a - b)=25,求a*a+b*b+ab的值 -
司芬宰19552911847 ______ 2(a*a+b*a) =(a+b)(a+b)+(a-b)(a-b) =1+25 =26 a*a+b*b=13 4ab =(a+b)(a+b)-(a-b)(a-b) =1-25 =-24 ab=-6 a*a+b*b+ab =13-6 =7

席妻泼1242怎么算(a+b)(a - b) -
司芬宰19552911847 ______ 展开全部(a+b)(a-b)=a^2-ab+ab-b^2=a^2-b^2 或者直接根据平方差公式(a+b)(a-b)=a^2-b^2

席妻泼1242若a,b都是非零的有理数,那么a|a|+b|b|+ab|ab|的值是多少 -
司芬宰19552911847 ______ 当a>0,b>0时, =1+1+1=3; 当a>0,b=1-1-1=-1; 当a0时, =-1+1-1=-1; 当a=-1-1+1=-1.

席妻泼1242The new teaching building is - ----- - the yellow one. A.as three times high as B.three times. -
司芬宰19552911847 ______ B 试题分析: 句意:新的教学大楼是黄色的那一个的 .这里问倍数,倍数的表达有三种:1. “A+倍数+形容词或副词的比较级+than+B”,表示“A比B大(长、高、宽等)多少倍”.如:The car runs twice faster than that truck. 这辆小车的速...

席妻泼1242The new teaching building is - _____ - the yellow one. -
司芬宰19552911847 ______[选项] A. as three times high as B. three times the height of C. three times high than D. as three times the height of

席妻泼1242一道英语选择,有讲解 Thisis( )news. -
司芬宰19552911847 ______[选项] A. such a good B. a very good C. so good a D. such good

席妻泼1242魔兽争霸中的快捷健的用法 -
司芬宰19552911847 ______ A. - ATTACT,攻击 不愧是字母之首,魔兽的乐趣也就是一个字,A!常常听到有人说:“你不会A他啊” B. – BUILDING, 建造 框个农民按B吧. 英雄魔法:大法师的冰风暴,火法师的放逐,恶魔猎...