Tìm các số có hai chữ số biết tổng hai chữ số bằng 7 và tích của chúng bằng 10

mọi người giải hộ em bài này với ạ em cần gấp, em cảm ơn trước

Trung bình cộng của hai số bằng 15.Tìm hai số đó, biết số lớn gấp đôi số bé

moi nguoi oi giup minh voi minh can gap

I) Choose the most suitable answer A, B, C, or D to complete the following passage. Air pollution is caused ________(1) ill health in human beings. In a lot of countries, there are ________(2) limiting the amount of smoke factories can produce although there is not enough _______(3) on the effects of smoke on the atmosphere. Doctors have ________(4) that air pollution causes ________ (5) diseases. The gases from the exhausts of cars _______(6) also increased air pollution in most cities. The ________ (7) of petrol produces a poisonous gas, which is often collected in busy streets circled by high buildings. Children _______(8) in areas where there is a lot of lead in the atmosphere can not think as ________(9) as other children, and are clumsy when they _______(10) their hands. 1. A. from B. on C. over D. of 2. A. laws B. ideas C. problems D. regulations 3. A. news B. article C. information D. newspaper 4. A. agreed B. pointed C. disagreed D. proved 5. A. lung B. heart C. liver D. stomach 6. A. had B. have C. has D. having 7. A. water B. lead C. gas D. exhaust 8. A. lived B. live C. to live D. living 9. A. quick B. slowly C. quickly D. slow 10. A. touch B. use C. handle D. collect

EXERCISES ON “BOTH ... AND, EITHER .. OR, NOT ONLY ... BUT ALSO, NEITHER ... NOR” 22. The boy is intelligent . He is hardworking, too. (both ... and) ................................................................................................................................................................ 23. He didn’t want coffee. He didn’t want tea, either. (neither ... nor) ………………………………………………………………………………………………………….. 24. Mary has both toothache and headache. (not only ... but also) ................................................................................................................................................................. 25. Helen likes cats. Mary likes cats. (both ... and) ................................................................................................................................................................. 26. You can take these tablets. You can also seek a doctor’s advice. (either ... or) ................................................................................................................................................................. 27. The thief stole my money. He also tore up my identify card. (not only ... but also) ................................................................................................................................................................. 28. He spoke French. He spoke German. (both ... and) ................................................................................................................................................................. 29. She should get a scholarship or she should work her way through medical school. (either ... or) .......................................................................................................................................................... 30. I’m not happy and you aren’t either. (neither ... nor) .................................................................................................................................................................

moi nguoi oi giup minh voi minh can gap

ai giúp mik với mik đag cần gấp ai làm nhanh nhất và đúng nhất mik cho 5 sao nha

Cho tam giác ABC vuông tại A . Đường trung trực của các canh AB và AC cắt nhau tại I . CM : a, OB=OC b, BOC =2(180 độ - BAC ) và O là trung điểm của BC MN GIUP MIK VS

giải câu 3C thui nhe theo cách lớp 6 giúp em ạ đây là bài lũy thừa nhanh một chút ạ em camon 3C thui ạ