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
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![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](/uploads/image/z/6974537-41-7.jpg?t=%E5%90%88%E5%B9%B6%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E4%B8%AD%E7%9A%84%E5%90%8C%E7%B1%BB%E9%A1%B97X-2X-3X+++++++++++++++++4a%26%23178%3B-3%2B2a-5+++++++++++++++-xy%2B4xy-y+++++++++++2a%26%23178%3Bb-4ab%26%23178%3B%2B3a%26%23178%3Bb%2B3ab%26%23178%3B++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%E8%A6%81%E7%BB%86%E8%8A%82)
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
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
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
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
你把式子写清楚,我这怎么显示两块的?
1.5x
2.4a²+2a-8
3. 3xy-y
4. 5a²b-ab²
2X a(4a+2)-8 y(3x-1) ab(5a-b)
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
= (...
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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
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