a+goldfish+lays+eggs

暴沾昭4468己知a - b=2倍的根号3减1,ab=根号3,则(a+l)(b - l)= -
淳璧习18632938789 ______ a-b = 2√3 - 1 , ab =√3 (a+l)(b-l) = ab -a +b -1 =ab - (a- b)-1=√3 -(2√3 - 1)-1=-√3

暴沾昭4468gold+fish=goldfish这样的单词,七个, -
淳璧习18632938789 ______[答案] greenhouse rainbow policeman policewoman businessman businesswoman postcard icecream icebox

暴沾昭4468设直线l的方程为:(a+1)x+y+2 - a=0 1若直线在两轴上的截距相等,求l的方程 2若l不经过第二象限,求实数a...设直线l的方程为:(a+1)x+y+2 - a=01若直线... -
淳璧习18632938789 ______[答案] 1、直线在两轴上的截距相等,可得: a-2=(a-2)/(a+1) 因a+1≠0 解得:a=2 所以直线方程为:3x+y=0 2、若l不经过第二象限所以有: 2-a≤0 -(a+1)>0解得:a

暴沾昭4468已知直线l1:ax+(a+2)y+1=0,l2:x+ay+2=0.若l1⊥l2,则实数a的值是( ) -
淳璧习18632938789 ______[选项] A. 0 B. 2或-1 C. 0或-3 D. -3

暴沾昭4468i think a goldfish is very easy - --? to take care\ to look after为什么加to -
淳璧习18632938789 ______ to look after 翻译:我认为金鱼非常容易照顾.解析:sb think sth(或者it) +形容词+动词不定式(to)+动词原形.表示某人认为某事...take care of 词组,照顾的意思,这里如果有of的话,也是可以使用 to take care of look afer 词组 照顾的意思

暴沾昭4468设f(x)是以l为周期的连续函数,证明§a,a+l f(x)dx与a无关 -
淳璧习18632938789 ______ f(x)是以l为周期的连续函数=> f(x+l) = f(x) I= ∫(a,a+l) f(x)dx let F(x) = ∫ f(x)dx I = F(a+l) - F(a) dI/da = F'(a+l) - F'(a) = f(a+l) - f(a) = f(a) - f(a) =0 dI/da =0=> I is independent of a

暴沾昭4468花程式中子房上位、二心皮、一室的表示形式是. A.G(2+1) B.G2:1 C....
淳璧习18632938789 ______[选项] A. 2a

暴沾昭4468You - --- - to feed your goldfish much.lt doesn't eat a lot. -
淳璧习18632938789 ______ 答案C. don't need 从意思上看是这样的:你不必给金鱼喂太多.它吃的不是很多.因此A need和D should不对 那么就是用B科学实验是C needn't后面要接动词原形,因此答案就很明确了