Question

合并下列各式中的同类项

7X-2X-3X 4a²-3+2a-5 -xy+4xy-y 2a²b-4ab²+3a²b+3ab²
要细节

Answer 1

第一个是: 2x
7X-2X-3X
= 7X -(2X+3x)
= 7x - 5x
= 2x

第二个是: 4a²+2a-8
4a²-3+2a-5
= 4a²+2a-5-3
= 4a²+2a-8

第三个是: 3xy-y

-xy+4xy-y
= (-xy+4xy) - y
= 3xy-y

第四个是: 5a²b-ab²
2a²b-4ab²+3a²b+3ab²
= (2a²b+3a²b)+(3ab²-4ab²)
= 5a²b - ab²

Answer 2

7X-2X-3X
= 7X -(2X+3x)
= 7x - 5x
= 2x

4a²-3+2a-5
= 4a²+2a-5-3
= 4a²+2a-8

-xy+4xy-y
= (-xy+4xy) - y
= 3xy-y

2a²b-4ab²+3a²b+3ab²
= (2a²b+3a²b)+(3ab²-4ab²)
= 5a²b - ab²

Answer 3

你把式子写清楚，我这怎么显示两块的？

Answer 4

1.5x
2.4a²+2a-8
3. 3xy-y
4. 5a²b-ab²

Answer 5

2X a(4a+2)-8 y(3x-1) ab(5a-b)