一、i(2-i)(1-2i) 二、5(4＋i)^2/i(2＋i)
问题描述：
一、i(2-i)(1-2i) 二、5(4＋i)^2/i(2＋i)
答
1.=(1+2i)(1-2i)=1-(2i)^2=5
2.=5(4+i)^2/(-1+2i)=(-1-2i)*(4+i)^2=(-1-2i)(15+8i)=1-38i
相关推荐
- 【高二数学】-MATH-数系扩充和复数的一道判断题...》》》下列三个命题中,请判断正误（A）如果复数z1=根号5*i,z2=根号2-根号3*i,z3=-根号5,z4=2-i,那么这些复数对应的点共圆（B）|cosb+isinb|的最大值是根号2,最小值为0（C）x轴是复平面的实轴,y轴是复平面的虚轴,所以实轴上的点表示实数,虚轴上的点表示虚数-------------选出答案后,请解释原因..
- 高中英语必修5第一单元listen strlictlires第二题rewrite each pair of sentences as one ,using the past participle as the attribute or predicative1.i found this plate on the floor.the plate was broken in pieces.2 i saw a tall .dark and handsome man.his name is xiao ming .3 i looked at that modern abstract painting .it was coloured in yellows and greens.4 yesterday i got the answer to my question on the internet it was the one i expected.5 she is one of my friends.she
- 初二英语、按要求改写句子1、Can they speak French?I want to know （合并为一句） 每空一词I want to know ＿＿ ＿＿ ＿＿ speak French.2、Li Lei draws better than anyone else in his class （改为同义句）Li Lei ＿＿ ＿＿ in his class 3、Are the children playing games?Can you tell me?（合并为一句）Can you tell me ＿＿ the children ＿＿ games?4、Does the shop close at six every day?Do you know?（合并为一句）Do you know ＿＿ the shop ＿＿ at six every day?5、Mike doesn"t jump as high as jack (改为同义句）Jack ＿＿ ＿＿ than Mike
- 一道高二的题,复数的题.计算：（2+7i）-丨-3+4i丨+丨5-12i丨i+3-4i=?
- 中英互译：1.一些神奇的书 2.微笑着点头 3.保持安静 4.许多钱 5.大声喊 6.告诉真相7.A man visit the emperor with some new clothes.二.填空,每格一词There's a lot of__in the bag.2.____is the eleventh month of a year.3.Please put on the___.It's beautiful.4.Don't____the zoo.5.The little child can__,but he can't___.He likes__.三.改句子I like the pink dress.I like the blue dress.用which提问2.I like the short skateboard.I like the long skateboard.用which提问3.Sally wants some apples on the desk.否定句4.The empero
- 初二英语(宾语从句)1}If he can't catch the bus,_________________________.2}If Lucy tidies her room every day,_____________________.3}If you don't want to be fatter,_________________________.4}If he doesn't feel wall,_________________.{最好能再翻译一下,}5}If I eat too much lunch ,_______________6}If I don't help others,__________--.
- 初三英语能力提高习题急!一.翻译句子：1.那些鞋子对于我来说不是太小就是太大.Those shoes are （ ）too big （ ）too small for me.2.从我们上次见面以后,已经有十个多月了.（ ）is more than ten months （ ）we met last.3.我在数学方面有点弱,我需要你的帮助.I’m （ ）（ ）（ ）（ ）（ ）.I need your help.4.他既不会跳舞,也不会唱歌.He can （ ）dance （ ）sing.5.二次世界大战期间五千多万人失去了生命.（ ）50 millions people （ ）（ ）（ ）during World War Ⅱ.6.人们应该学会怎样保护自己.People should learn （ ）（ ）（ ）（ ）.7.班会已经开了半个小时了.The class meeting （ ）（ ）（ ）（ ）（ ）.The class meeting （ ）（ ）（ ）（ ）（ ）（ ）（ ）.二.适
- 设计一个算法,求出满足条件1×3×5×…×n>50000的最小正整数n,并画出相应的程序框图正解是：第一步,S=1 i=3第二步,如果S≤50000,执行S=S×I i=i+2 否则执行第三步第三步,i=i-2第四部,输出i我主要是不理解第三步,为什么i还要减去2呢!这步表示什么呀 什么意义呢!
- 一、翻译1.杰克过去常常不吃早饭就去上班.Jack ___ ___ go to work ___ breakfast.2.他害怕乘坐飞机.He's ___ ___ ___ in a plane.3.我认为嘲笑别人是不对的.I__think it's right___ ___ ___ ___.4.瞧,胡老师房间的灯还亮着.Look!The light in Mr Hu's room ___ ___ ___.5.被允许做某事_____ 6.get the ears pierced_____ 7.兼职工作_____ 8.driver's license_____ 9.熬夜____ 10.to to the movies_____ 11.对某人要求严格_____ 12.clean up____ 13.对····有好处____ 14.primary school____ 15.此时,现在_____ 16.perform a play_____二、句型转换1.We must tie the tree to t
- (1)\x05硫酸铜受热分解生成了氧化铜和气体.气体是由SO2 SO3 O2中的一种或几种.受热时温度不同,生成的气体成分也不同.(2)\x05SO2 SO3都能被碱石灰吸收.(3)\x05SO2 SO3都能被氢氧化钠溶液吸收.{提出猜想}根据质量守恒猜测气体的成分：I只含---一种：II只含有SO2 O2二种III含有SO2 SO3 O2三种{设计实验}利用下图装置加热硫酸铜粉末直至完全分解A为加热硫酸铜装置B为生成气体通过碱石灰装置C为通过碱石灰气体通过氢氧化钠溶液装置D为通过氢氧化钠溶液的气体通入集气瓶装置{获取事实}（1）\x05用带火星的木条伸入集气瓶D,发现木条能复燃,说明气体中含有----（2）\x05已知硫酸铜粉末质量为10g,完全分解后,各装置的质量变化如下表所示：请通过计算,判断出实验条件下硫酸铜分解的化学方程式是哪一个?A 3CuSO4===3CuO+SO3↑+2SO2↑+O2↑B 4 CuSO4===4CuO+2SO3↑+2SO2↑+O2↑C 5CuSO4===5CuO+S
- 同学们排成方队做操,从前、后、左、右数,小明都是第5个,一共有多少个同学做操
- 已知等腰梯形ABCD中,AD平行BC,角B=60°,AD=2,BC=8,则等腰梯形的周长是多少?