1) Упростить:

1.1) 3a - 4b + 5c + 7b + 4a - 4c = ?

1.2) 3x - 4y + 5z - 3x + 4y + 5z = ?


2) Вычислить дроби и сократить:

2.1) 3/4 + 5/4 = ?

2.2) 12/17 - 8/17 = ?

2,3) 3/5 + 2/7 = ?

2.4) 3/7 - 5/21 = ? ПЖ СРОЧНО 100 БАЛЛОВ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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