四道题的过程答案、有好评

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四道题的过程答案、有好评
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四道题的过程答案、有好评
四道题的过程答案、有好评

 

四道题的过程答案、有好评
( 2x²y + 3xy² )-( 6x²y - 3xy² )
= 2x²y + 3xy² - 6x²y + 3xy²
=-4x²y + 6xy²
=2xy( 2x - 3y )
(5mn - 2m + 3n )+ (-7m - 7mn )
= 5mn - 2m + 3n - 7m -7mn
=-2mn -9m + 3n
(6a² - 8a +11b³ )- (11a² + 2b³)
= 6a² - 8a +11b³ - 11a² - 2b³
=-5a² - 8a + 9b³
(2ab + 3b² - 5 )- (3ab + 3b² -8 )
= 2ab + 3b² - 5 - 3ab - 3b² + 8
= -ab + 3