你能帮帮他们吗
精彩回答
下列运算正确的是( ) A. (﹣3)+(﹣4)=﹣3+﹣4 B. (﹣3)+(﹣4)=﹣3+4 C. (﹣3)﹣(﹣4)=﹣3+4 D. (﹣3)﹣(﹣4)=﹣3﹣4
11个月前
I can't go to play football with you. I'm afraid. (合为一个句子)
1年前
—Hey, it's raining! —Yes, it _____ for about 3 days.
1年前
高数题 已知函数z=(1/3)ln(x-y),x=sect,y=3 sint 求(dz/dt) | t=π
1年前
Don't put your things ________(到处). Put them away, please.
1年前