Tính hợp lí giúp mk với: 4) 3 5/7-5/7*4/15+(-5)/7*11/15. 8) 1/5-1/7+1/11 / 7/5-7/7+7/11 + 2/13+4/23-6/29 / 7/13-21/29+14/23. P/S: Ở câu 8, phép tính 1/5-1/7+1/11 và 2/13+4/23-6/29 là tử số, phép tính 7/5-7/7+7/11 và 7/13-21/29+14/23 là mẫu số nhé (tại mk ko biết viết nó thế nào). Chỗ 3 5/7 là hỗn số nhé.

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