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giúp e vs ạ tks giải phương trình

Giải giúp mình câu 9 ,11,12 cảm ơn nhiều

I. Put the verbs in brackets into the pre- sent simple or future simple. 1. I...(help) you with the shopping before I... (go) to the gym 2. I ....(not/be) at home when my parents ... (have) the dinner party. 3. They ... ( buy) a new car when they ... (sell) their old one II. Choose the correct. 1. James is a good student. He ... his homework every evening. A.do B.is doing C.does 2. Ted...his car last month. A. Sold B. Has sold C. Is selling 3. The sun ... every morning A. Is ringing B. Rises C. Was rising 4. I...my first cassette player when I was eighteen. A. Have bought B. Am buying C. Bounght III. Correct the mistakes 1. Peter plays football at the moment. 2. My parents have bought a new fridge yesterday. 4. Iam going the gym every Tuesday. 5. I expect I go shopping on Saturday. 6. Do you come with us tomorrow morning?

Giải bài toán bằng cách lập phương trình . (42/x+2)+(20/x-2)=5

LAM DUM MINH NHA CAC BAN MINH CAN NGAY

Giúp em vs ạ, bài này khó quá ;-; mong mn giúp em vs

Viết tập hợp các chữ cái có trong từ “Toán học “

Help....................................................

giúp mình bài1 vs bài 2 vs ạ mình cảm ơn Ạ