Bài 1 : C = 5/7 . -3/5 - 5/7 . 2/5 + 1/3 .3 Bài 2 : Tìm x 8/7x - 3/7x = 1/14 - 2/7

Bài 1 : C = 5/7 . -3/5 - 5/7 . 2/5 + 1/3 .3 Bài 2 : Tìm x 8/7x - 3/7x = 1/14 - 2/7
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