Bài 1: Tìm giá trị không thích hợp của x,y trong các biểu thức sau: a, 3x ²y + 5/ (x - 1)(y + 2) b, 5xy/ x - xy c, 4x - y/ (x + 2)(2x - y) Bài 2: Tìm x biết: a, (3x - 5) - (x - 1) = (x + 6) - (x - 3) b, 2(x - 4) - 3(x + 1) = 4 c, (x ² - 3x + 1) + (-x ² + x - 3) = (5x - 1) - (5x + 3) ( Giải chi tiết, hứa vote 5 sao ạ)

X. Rearrange the given words or phrases to make meaningful sentences. 86. to share/ others/ Joe/ a book/ experiences/ wrote/ his/ with. => __________________________________________________________________ 87. occurred/ department/ responsibility/ The/ for/ what/ denies. => __________________________________________________________________ 88. soil/ to avoid/ washed away/ They/ a wall/ built/ being. => __________________________________________________________________ 89. expecting/ any news/ three weeks/ After/ had stopped/ we/ to hear. => __________________________________________________________________ 90. the keys/ remember/ here/ correctly, / you/ on your way/ supposed/ If/ I were/ to collect. => __________________________________________________________________

Đột biến gen phát sinh do các tác tác động lí, hoá hay sinh học ở ngoại cảnh hoặc do những rối loạn sinh lí, hoá sinh của tế bào đã gây ra A. những sai sót trong quá trình nhân đôi của nhiễm sắc thể. B. những sai sót trong quá trình phiên mã C. những sai sót trong quá trình tnhân đôi ADN D. những sai sót trong quá trình phân li của các gen (giải thích chi tiết dùm em ạ :( )

cho 19.6g Cu(OH)2 tác dụng hoàn toàn với 182.5g dd HCl 10% a hỏi chất nào còn dư sau phản ứng và bao nhiêu g b) tính nồng độ % CO2 thu được sau phản ứng

giải thích sự khác nhau về phạm vi nghĩa của các từ nghĩa sau:Đánh-cắn #giúp em em đang cần gấp

IX. Finish each of the following sentences so that its meaning stays the same. 76. I don’t want to go to work this morning. => I don’t feel like _____________________________________________________ 77. Dave said that “Let’s go to the movies”. => Dave suggested ____________________________________________________ 78. It’s not a good idea to drive in the heavy rain. => It’s better to avoid __________________________________________________ 79. Her explanation was so complicated that I couldn’t understand anything. => Her explanation was too______________________________________________ 80. She felt very sleepy, so she went to bed early. => She went _________________________________________________________ 81. Phillips’ mother gave him a bicycle for his birthday. => Phillips was________________________________________________________ 82. The flight to London lasted seven hours. => It took ____________________________________________________________ 83. It is not easy to train horses. => Horses are__________________________________________________ 84. The red car was more beautiful than the blue car. => The blue_________________________________________________________ 85. You can buy many kinds of tax free goods before getting on the plane. => Many kinds of goods _______________________________________________

Tìm ƯCLN (7n+3,8n-1) với n thuộc N*.Tìm điều kiện của n để 2 số đó nguyên tố cùng nhau

Cho 15,5g Na2O tác dụng với H2O thu được 0,5l dung dịch Bazo.Tính Cm dung dịch Bazo

1.Our parents join hands to give us a nice house and a happy home. A. deal with B. manage C. help together D. work together 2.Some of my students are quite _______ and enjoy playing tricks on their friends. A. mischievous B. obedient C. supportive D. passive 3.When he was driving to work , he ____ an accident. A. seeing B. to see C. saw D. had seen 4.Since her first year at university, my sister was allowed _______ the motorbike. A. to ride B. to be ridden C. riding D. ride 5.The number of the participants in the survey _______ 250 students for Oxford University. A. are B. was C. were D. have been

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