合并同类项的100道练习题至少(4项）加解发

2a+3ab-4a+5b

2a-5b+4c-7a+5a+5b-4c

4a+6a+3k-2c+3k+5c-7a

3b-6c+4c-3a+4b

3b+3c-6a+8b-7c-2a

6b-4a+6c+7a-6a+7b-3c-6b

5z+3c+7b-3c-7z-6c+4b

5b+2c-7b+4z-3z-7c

2x-3c-6c-5a+2c-x+4c+6a-x

-2c+3c+7b-2z-5b+2z

2c-4s-6s+6c-2s

5c-6c-7c-8c+2b-6b+9b+7c

-3c+8b-5z+8b-4c

5z-5b+6b-2z-3a+9a-3a

2z+5c-7z+8b-3a

3c-7b+5z-7b+4a-6n+8b-3v+9n-7v

3ab-4ab+8ab-7ab+ab

7x-(5x-5y)-y

23a3bc2-15ab2c+8abc-24a3bc2-8abc

-7x2+6x+13x2-4x-5x

2y+(-2y+5)-(3y+2)

(2x2-3xy+4y2)+(x2+2xy-3y2)

2a-(3a-2b+2)+(3a-4b-1)

6x2-7x2+15x2-2x2

2x-(x+3y)-(-x-y)-(x-y)

2x+2y-[3x-2(x-y)]

5-(1-x)-1-(x-1)

( )+(4xy+7x2-y2)=10x2-xy

(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3

3ab+6ba+9ab