Giúp mình câu 3, 5, 6,7 vs mọi người ơi

70. Please forgive me for (not write) to you. 71. There is no point in (have) a car if you never use it. 72. It’s a waste of time (buy) thing you don’t need. 73. I shouted ( warn) people of the danger . 74. The President has a team of bodygaurds ( protect)him. 75. She is bound (pass) the exam. 76. He is difficult ( understand) 77. I was interested (hear) that Diane has got a new job. 78. We weren’t allowed (leave) the building 79. I’m looking forward to (go) away next week . 80. Mary promised (buy) me a drink. 81. Jonh made so much noise when I was trying (sleep). 82. It was a difficult question (answer) 83. It was very kind of you (do) my shopping for me. 84. She was the first (arrive) here. 85. You should avoid (travel) during rush hour. 86. We have all agreed (take) a pay cut so that our company will survive. 87. For the time being, the police won’t allow anyone (leave) the building 88. Personally, I wouldn’t dare (criticise) my boss. 89. We’ve delayed (fix) the date of the wedding (please) everybody. 90. The accused denied (be) anywhere near the bank during the robbery. 91. Visitors have been directed (not carry) cameras into the museum. 92. Most men dislike(wear) the same shirt 2 days running 93. Surely yopu just can’t fail (notice) the constant rise in the cost of living. 94. I don’t fancy(be) responsible for a party of school children for a week. 95. It’s hard (imagine) (live) without electricity. 96.I keep (leave) my glasses all over the place. 97. I’ve never managed (get) to the end of “War and Peace”. 98.I suggest (take) a taxi. 99. If we wish (visit) Canada before we’re old, we’d better start(save). 100. It’s hard (imagine) that anyone actually wants (work) down a mine

CÓ GIẢI THÍCH nhessssssssssssssssssssssssssssssssssssss

Làm ơn giải giúp em với ạ em đang cần gấp Em cảm ơn nhiều!!!

Cho em hỏi bài 1 với ab bài 2 ạ

tìm x để : lAl=A, A=(√x-1)/(√x+1)

Gpt: Cosx-√3sinx=√2 theo CT asinx+bcosx=√(a^2 +b^2)sin(x+a), với cosa=a/√(a^2 +b^2) và Sina=b/√(a^2 +b^2) (SGK Toán đại số 11 cơ bản tr35)😀

giải hộ với ạ (√x-1)/(√x+1)=1/6

Trong một cái hộp có đựng 4 viên bi màu đỏ và 1 viên bi màu xanh. Tính xác suất để lấy ra viên bi màu xanh.

Giải thích giúp mình: Nhỏ từ từ đến dư dd AlCl3 vào dd hh NaOH và NaAlO2 Đáp án: Đáp án: + Ban đầu không có ht gì, vì NaOH dư AlCl3 + 4NaOH -> NaAlO2 + 3NaCl + 2H2O Sau một tg xuất hiện kt keo trắng: AlCl3 + 3NaAlO2 + 6H2O -> 4Al(OH)3 + 3NaCl *** Vậy tại sao AlCl3 lại tác dụng với NaOh trước mà không phai NaAlO2 trước vậy ạ