раскройте скобки и приведите подобные слааемые

 

1) (3.1a + 2.25b - a) - (1.4b - 6.3a)

 

2)3/8 * (2.4x - 3.2y) - 1.8 * (5/9x + 1.5y)

 

 

                                             помогите пожалуйста!!!!!!!!!!!!!!!!!!!!!!!!!

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