Three questions to remove brackets Question 1: (a-2b) - (C-D) Question 2: the square of x-3 (X-2) Question 3: the square of a - (a-b + C)

Three questions to remove brackets Question 1: (a-2b) - (C-D) Question 2: the square of x-3 (X-2) Question 3: the square of a - (a-b + C)

-(a-2b)-(c-d)
= -a+2b-c+d
x²-3（x-2）
= x²-3x+6
a²-（a-b+c）
= a²-a+b-c

A question of removing brackets
-Brace - x + y-2x - [- (X-Y) + 1] - y brace
The braces don't come out, so use Chinese characters instead

Finally, it's 2x + y + 1

-How to get rid of brackets

-[-(m-n)]
=M-N (take M-N as a number, then negative is positive)

Questions in brackets
1.The students in Class 1,Grade 7 will go on a trip to Beijing (by train)
_____ _______ the students in Class 1,Grade 7 will go on a trip to Beijing
2.The children usually knock on (their neighbours'doors at Halloween.)
_____ _______ do the children usually knock _______ at Halloween?

1.How will
2.Whose door,on