作业疗法士

(1-x+x^2)(1+x)^6展开式中x^3项的系数是多少 希望有过程 (x-1/x)^n的展开式中,第3项与第6项的系数互为相反数,求展开式中系数最小的项 X+3/20X=5520过程3/20是指20分之3 20X+10(45-X)=650求过程谢谢 圆周率为多少,精确一点,怎么算的?路, 圆周率计算的那么精确有什么意义? 圆周率的精确计算方法 30+20x=90-10x 10x^2-20x-30用十字相乘法 10y-10x=1500/30 y*(1-20%)*20-20x=1200/30的一元二次方程组怎么解呢? 我写的英语短文 with the development of modern civilization .more and more technology have been used today.however,some new technology such as disposable plastic bag that give us great convenient whilealso bring us a lot problem as wellso new p 请你们帮我改我写的英语文章Do you think having a hobby is good for people's life?In what way?-Of course good,because i think hobby is not work,some rest kind ofWhen i imagine about a work that give me feel enjoying and hard but hobby just 我写的文章 求改(英文）The benefit of having a main language If there no one main language.We will not be able to exchange. There also want to express to express their meaning is not clear.So,It's very important to master a language. mor Get up“Ding ding”,Oh!What a …With two eyes closing,I’ve been searching the clock with my hands.But it doesn’t stop at all.It keeps shouting.Oh!It’s getting bigger and bigger and turns to a monster!Oh…Where am Suddenly,I opened my eyes,j 这篇短文改成英文要怎样写? 英语翻译我爱足球今天,足球已经成为了世界第一运动,越来越多的人开始喜欢踢球,我也是.我在12岁时便爱上了足球,那时候只是好奇,和同学们踢着玩.后来,我越来越喜欢足球了,并且花了很多 πR+2R=15.42求R的值,列算式 14.54417=2Rarcsin(13.857/2R) 求R怎么解?我想算一下半径,已知弧长14.54417,弦长13.857,R怎么求呢? 3*2r+2r*3/2=9 怎么解 [U/(16+R')]2R'=[U/(16+R'/4)]2R'/4 怎么解“2”是指数 南美洲是海洋性气候还是大陆性气候? 在Rt△ABC中,∠C=90°,AC=12,BC=5,求以AB为直径的半圆的面积 2πR+R+2R=13.92解了 方程来的 a:r:b=(b+r):2r:(2r+a)解这个方程拜托了各位 运输队要运两车货物.运输队要运两车货物,第一车重18吨,比第二车轻25%,第二车重多少吨? 运输队运送一批货物78吨的货物已运了9车,还剩6吨,平均每车运多少 已知一个扇形的圆心角为60度,所对弧长为12.56CM,求这个扇形的面积. 有几个像太阳一样大的星球? 和太阳一样发光发热的星星 哪些和太阳一样会发光发热的星星呢?并说理由 哪些和太阳一样会发光发热的星星 在rt三角形abc中,角c=90度,ac=5,ab=7,以bc为直径画半圆,求半圆的面积