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设x,y为非负整数,x+2y是5的倍数,x+y是3的倍数,且2x+y大于等于99,则7x+5y的最小值为多少? it takes me twenty minutes---------my homework 怎么填 已知函数f(x)={x3(x＞1） -x2+2x(x≤1）,若f(a)=-5/4,则a的值为A.-1/2或5/2 B .1/2或5/2 C -1/2 D1/2 设x,y是非负整数,x+2y是5的倍数,x+y是3的倍数,且2x+y≥99,求7x+5y的最小值. 设x,y是非负整数,使x+2y是5的倍数,x+y是3的倍数,且2x+y≥ 99.则7x+5y的最小值是 ?要埋点样计到... 英语连词成句：finish_minutes_homework_took_to_my_It_me_thirty_. It took her thirty minutes to get to the theater .[同义句替换】 It__him thirty minutes to finish his homework. A took B cost C spent D have 减去2-3m后等于6m^-3m-8的多项式是? 同义句转换1.He spent thirty minutes in finishing his homework.同义句转换为it took him ( ) ( ) ( ) ( ) finish his homework.2.i got a letter from my brother last weekend.i ( ) ( ) my brother last weekend.3.if you don't hurry up,you won't be 6m^3+3m^2-2m-3m^5-3m^4m=2013代入 带入后等于几6m^3+3m^2-2m-3m^5-3m^4 m=2013 急需小学五年级2（x-2.6)=8和8(x-6.2)=41.6 根据方程列出应用题并解答 小学五年级上学期的方程8x-3x 14=0怎么解?这个怎么解? 对于一切实数x,y,函数f(x)满足f(xy)=f(x)f(y),且f(0)≠0,求f(2010) 如果函数f(x)满足：对任意实数a,b都有f(a+b)=f(a)f(b).且f(1)=1.则f(2)/f(1)+f(3)/f(2)…+f(2011)/f(2010)= 设fx是定义在R上的函数,若f0=2010,对任意x∈R满足f（x+2）-fx≤3×2∧x,f（x+6）-fx≥63×2∧x,则f2010=设fx是定义在R上的函数,若f0=2010,且对任意x∈R满足f（x+2）-fx≤3×2∧x,f（x+6）-fx≥63×2∧x,则f2010=（ 已知函数f(x)对任意实数的a,b∈R满足:f(a+b)=f(a)+f(b)-6,当a>0时,f(a) It takes _____ ten minutes____ his homework.A,hin,do B,his ,to do C,his go D,him ,to do 2.6m*5-3m(m=0.85)要具体流程! It_____me about forty minutes to do my homework every day.A.cost B.uses C.spends D takes 若方程2x的K减2次方加2K=4是关于x的一元一次方程,求K的值 关于x的一元二次ax^+bx+c=0(a不等于0),(1)当a.c异号时,是说明该方程有两个不相等的实数根.(2)当a.c同号时,该方程要有两个实数根还必须满足什么条件?请你找出一个a.c同好且有实数根的一元二次 泊松分布一道题某商店中每月销售某种商品的数量服从参数为5的泊松分布,问在月初进货时要库存多少此种商品,才能以0.999的某商店中每月销售某种商品的数量服从参数为5的泊松分布，问在 谁能不落熟套地解释人生 二次函数y=ax^2+bx+c(a≠0）的值域是怎么求出来的即值域是B.当a>时,B={y|y≥（4ac-b^2)/4a};当a Tom likes playing basketball.Jim also likes playing basketball.合为一句 设函数y=f(x)的图象与函数y=g(x)的图象关于原点对称,且 f(x)=x2+ 2x.求函数y=g(x)的解析式 Tom's father likes shopping _____ his mother likes playing basketball.还有为什么?A.while B.when C.because D.however 已知函数f(x)=2x-1,g(x)=(x2,x≥0/-1,x＜0,）,求f(g(x)）和g(f(x））的解析式 Yangling likes playing basketball.改为疑问句急! 设a∈R,函数f(x)=ax^3-3x^2,若函数g(x)=f(x)+f'(x),x∈【0,2】,在x=0处取得最大值,求a的取值范围 无理数怎么运算变成有理数比如根号2,除了2次方,或者2n次方有没有其他途径?根号3 除了3n次方,有没有其他途径变为有理数?无理数，除以无理数，除了自身，除以其他无理数也能的有理数？