已知A=a的平方+b的平方-c的平方,B=-3a的平方+2b的平方+5c的平方,并且A+B+C=0,请问C是什么样的多项式?已知一个多项式减去-5x的平方+2x等于3x的平方-6x-8,请求出这个多项式.英语：用括号中所给单词的正确形式填空.He's ______(move) by her.Her story is so _______(move).The teacher was ___________with what the students said.(please)His hand writing is _____than yours.(bad) 改错.We must stop pollute the Earth.

数学
已知A=a^2+b^2-c^2,B=-3a^2+2b^2+5c^2,
A+B
=-2a^2+3b^2+4c^2
并且A+B+C=0，
C=2a^2-3b^2-4c^2
英语
He's moved (move) by her.Her story is so moving (move).
The teacher was pleased with what the students said.(please).
His hand writing is worse than yours.(bad).
改错
We must stop polluting the Earth.

his hand writing is (worse) than yours.
he's (moved) by her.Her story is so (moving).
the teacher was (pleased) with what the students said.
We must stop (polluting) the Earth.

英语：
He's moved (move) by her.Her story is so moving (move).
The teacher was pleased with what the students said.(please).
His hand writing is worse than yours.(bad).
改错
We must stop polluting the Earth.

moved ，moving ，pleased ，worse！ 把pollute 改为polluting

C=2a的平方-3b的平方-4c的平方
8（x的平方-x-1）
moved moving
pleased
worse
polluting