I did a chemical experiment last week.改为否定句.

I did a chemical experiment last week.改为否定句. ay+y'' = -exp[exp(i2x)]这里a为常系数,i为复数, matlab输入矩阵我要输入一个矩阵高手给看看哪儿错了,给改改呗 A=[1,1,-1,-1;-i*(k+alpha),-i*(k-alpha),-i*k+beta,i*k-beta;exp(-i*(k+alpha)*c),exp(-i*(k-alpha)*c)...,-exp((i*k+beta)*b),-exp((i*k-beta)*b);-i*(k+alpha).*exp(-i*(k+alph 设有条件表达式：（EXP）?i++:j--,则以下表达式中,(EXP)完全等价的是A（EXP!=0）B（EXP==0)C(EXP==1)D(EXP!=1)那位朋友帮我解答哈呀,我不懂这EXP是什么意思? (exp)?a++:b-- 麻烦高手改错!1. Chemistry did (A) not emerge like (B) a science until (C) after the scientific revolution in the seventeenth century and then only rather (D) slowly and laboriously.2. This (A) basic chemical knowledge, which was applied (B) i 把 exp(pi+i) 写成 复数a+bi 的格式暂时的想法：exp(pi) * exp(i*1)=exp(pi)*(cos1+i*sin1)=exp(pi) cos1 + iexp(pi) sin1.我做得对么?还有其他更好的办法么? I did a radio interview中did起什么作用? exp exp i did like a cigarette是什么意思 I did a lot of shopping Well ____ know him and well ______ know me.A. I did; he did B. did I; he did C. did I; did he D. I did; did he 选哪个,为什么?请翻译一下. exp(a)-exp(b)怎么计算?结果是什么? Did I I went to see the wonderful film last night?---------A.I did too B.Neither did I C .so did I D .I did so she used to be a teachera..so did she,so did i b///so she did,so did ic.so did she,so i did d.so she did,so i did A:You forgot your purse when you went out.B:Good heavens,( ).A.so did I B.so I did C.I did so D.I so did