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I was on a bus one March evening.I was on a bus one March evening.The driver didn’t intend to start the bus soon because it was not yet full.A middle-aged woman got on.Tired and sad,she told her story tearfully ,not to anyone in particular.On her w 为什么能用 判别式法求值域请用映射 相关知识解释 对于判别式法求值域,如果定义域不为R,就不能用了吗?换句话说,判别式法求值域的条件是什么? 关于数学家的数学知识故事有关于数学家发现的数学知识急用, 若A=99^9/9^99,B=11^9/9^90请比较它们的大小,并说明理由 用三中不同的方法比较十分之九和十二分之十一的大小（求过程! 3.5:0.7化简可以记作5吗?3.5:0.7化简后可以记作5吗?是化简后的,不是化简 求数学家有趣的故事 谁能帮我找两个数学家的幽默故事每个故事三十个字左右 判别式法求值域 ∵x∈R,∴Δ≥0 的原理是啥? 有人知道数学家的有趣的小故事吗?急需啊~~~谢谢啦 数学家的幽默故事,要好的, 化简1： 关于图形的平移与旋转的趣味小故事、数学家、历史故事 谁有谁有啊 (1)若|x+y+5|+(xy-6)的平方=0,求 x的平方+y的平方 (2)若a+b+4a-6b+13=0,求a的b次方.(3)若x-4x+y+2y+5=0,求2x-y (4)已知ab+a+b+1=4ab,求a和b (5)已知x-4x+1=0,求x四次方+x四次方分之1 的值 谁知道关于分式的数学家·趣味故事和历史故事啊?跪求! 第6、7题用方程. 与轴对称有关的历史故事,趣味小故事,数学家有哪些多一点 轴对称有关的历史故事,趣味小故事,数学家有哪些 π/6+π/4=5π/12是怎么算出来的 两个连续偶数的和是18,那么这两个数的最小公倍数是 【100分】求几道数学题答案【满意再加】1、求值域：y=（x²－2x＋4）/（x²－3x＋3）2、已知公差不为0的等差数列{an}中,若a1、a3、a9成等比数列求（a1+a3+a9）/（a2+a4+a10）3、当x∈（1,2）时, the boy was born ____the morning of December 30TH怎么填 8*1/9+9*1/10+10*1/11+...+99*1/100=? When were you born I was born _____ a cold winter morning in 1996.A on B in C at 为什么是on?这里并没有具体到那一天啊? i was born ____ a cold winter morningon /in I was born _______ the morning _______February 25th,1997.A.in,of B.on in C.in in D.on of He was born _____ December 10th. -When was Tom born?--He was born ______December 10th,1968. He （was） born （in） the（ morning） of June third1976 改错注：打括号的为改错的! He was born __ the morning of May 7th,1998.A.in B.on C.at D.of He was born _____the morning of June,1987.A.at B.in C.on D.for 注：