关于景物的诗

已知函数f(x)=√ax^2+(2a-1)x+1/4的值域为[0,+∞)则实数a的取值范围 就要教师招聘面试了.不知如何写,或者帮我写. 电工学电子技术基础题目,判断如图电路能否产生正弦波震荡?若不能震荡,试改变电路使之能震荡,并计算电路的震荡频率. He didn't come home early.He come home-----（late）.用所给词的正确形式填空. 有哲理性的好句要有50字以上的要不我不给15分了, 如图,在△abc中,∠c=90°,ae平分∠a交bc于e,cd⊥ab于d,交ae于f,fm//ab交bc于m.求ce=bm 一种商品进价是2500元,增加进价的一成四为定价.如果按定价八六折出售这种商品,结果销售是赚还是赔? She___(noe go)to bed untilshe ___(finish )her work. Linda said she would to to the cinema tomorrow. 已知关于x的不等式组：x-a＞0,5-2x＞1的整数解共有4个,求实数a的取值范围 She always gets up early to catch the first bus.这样有错吗? 若不等式2x^2-2（a-1）x+（a+3)>0的解集是R,求实数a的取值范围 三角形ABC中,角ACB=90度,CD垂直AB于D,AE是角平分线交CD于F,FM平行于AB交BC于M,CE与MB的关系 电功率表示什么?什么叫额定功率?"220V,25W''的含义是什么? 已知关于x的不等式x-a≥0 、5-2x>1只有四个整数解,求实数a的取值范围 某专卖店每件20元的价格购进了一批内衣,然后以每件33元的价格卖出,当卖出总数的四分之五时,不但收回成还盈利128元,这批内衣有多少件?要算式 方程写详细点也行~ 已知关于x的不等式 2x^2-2(a-1)x+(a+3)>0 的解集是R求实数 a的取值范围 已知关于X的不等式2X²-2（a-1）X+（a+3）＞0的解集是R,求实数a的取值范围 Is there a forest in the park she said she would go to school tomorrow 为什么tomorrow修饰从句,怎么判断时间是修饰主句还是从句的 “Can she work out the difficult problem?”the teacher said. (改为含有宾语从句的复合句)The teacher asked she work out the difficult problem.My mother asked me ________ (not be) late for school My sister was born ______ the mor 已知数列an的前n项和为sn＝2的n次方 +a（a为长数）1.求a1.a2.a3已知数列an的前n项和为sn＝2的n次方 +a（a为长数）1.求a1.a2.a32.若数列｛an｝为等比数列，求常数a的值及an 已知正项数列｛an｝的前n项和为Sn,对任意n属于N*都有（a1）3次方+（a2）3次方+（a3）3次方+…+an3次方...已知正项数列｛an｝的前n项和为Sn,对任意n属于N*都有（a1）3次方+（a2）3次方+（a3）3次方+ When you are home,give a call to letme know you have arrived safely.这句话中哪是从句,那是主句?从句、主句怎么分? she said she would go home tomorrow 为什么tomorrow修饰从句,怎么判断时间是修饰主句还是从句的 .When I got to her home,she had gotten _ (dress). I arrived ____ the office at seven thirty this morning. He usually work (in the office )(in the morning)就划线部分提问 如图所示,在△ABC中,画出它们的三条中线AD,BE,CF.三条中线交于一点G,AG与GD的长度有什么关系?用刻度尺验证你的结论.换一个三角形试试看,看上述结论是否还成立?情况紧急, 【高中英语】we arrived at work in the morning and foundWe arrived at work in the morning and found that somebody ________ into the office during the night.A,brokeB.had brokenC.has brokenD.was breaking选B.break不是短暂性动词吗,为什么 科学的计算题.紧急容积为2.5升的塑料瓶,质量为100克,装满食用油后,瓶和油的总质量为2.35千克,这种油的密度多大? 英语单项选择：I'm hungry.I'm going to have lunch _____.A.hungry B.in the morning C.on Sunday