作业帮1.（x²-x+2)(-x-2-x²）2.（a-2b+3c)(2b-a-3c)3.(a+b-c-d)(a-b+c-d)还有英语也帮个忙,首字母填空One day a man in a restaurant was giving the waiter a lot of reouble.F______ he asked the waiter to turn on the air conditioner b______
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1.（x²-x+2)(-x-2-x²）2.（a-2b+3c)(2b-a-3c)3.(a+b-c-d)(a-b+c-d)还有英语也帮个忙,首字母填空One day a man in a restaurant was giving the waiter a lot of reouble.F______ he asked the waiter to turn on the air conditioner b______
1.（x²-x+2)(-x-2-x²）
2.（a-2b+3c)(2b-a-3c)
3.(a+b-c-d)(a-b+c-d)
还有英语也帮个忙,首字母填空
One day a man in a restaurant was giving the waiter a lot of reouble.F______ he asked the waiter to turn on the air conditioner b______ he was too hot.Then he asked him to turn it off because he was too cold.This went on for about half an hour.But the waiter was so kind that he did e_______ the man asked him without getting a_____.After that someone else in the restaurant asked w______the waiter did not drive him away."Oh,I do not care,"the waiter said with a s______,"We do not have any air conditioners at all."
能回答多少回答多少啦!过了今天作废!急死了.
1.（x²-x+2)(-x-2-x²）2.（a-2b+3c)(2b-a-3c)3.(a+b-c-d)(a-b+c-d)还有英语也帮个忙,首字母填空One day a man in a restaurant was giving the waiter a lot of reouble.F______ he asked the waiter to turn on the air conditioner b______
不知道你要不要过程,我懒得写了,你要是想要的话,再补充问题吧
（1）X^2-(X^2+2)^2= -X^4-3X^2-4
（2）-(a-2b+3c)^2= -a^2-4b^2-9c^2+4ab-6ac+12bc
（3）(a-d)^2-(b-c)^2=a^2+d^2-2ad-b^2-c^2+2bc
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