Đáp án+Giải thích các bước giải:
`(x-3)^2 -x(x-7)=12`
`=>(x.x-2.x.3 +3^2) -(x^2 -7x)=12`
`=>x^2 -6x +9 -x^2 +7x=12`
`=>(x^2 -x^2)+(-6x+7x)+9=12`
`=>x+9=12`
`=>x=3`
`x^2 -4 +3x(x-2)=0`
`=>x^2 -4+(3x.x - 3x.2)=0`
`=>x^2 -4x+3x^2 -6x=0`
`=>4x^2 -4-6x=0`
`=>2(x-2)(2x+1)=0`
`=>x-2=0` hoặc `2x+1=0`
`=>x=2` hoặc `x=-1/2`
Đáp án:câu 1: x=3 nha
câu 2 :x=2 ; x=-1/2
Giải thích các bước giải:
Exercise 3: Complete the second sentence so that it has a similar meaning to the first sentence. 1) “Where did you meet him?” Jimmy asked. => Jimmy asked 2) “When should I register for the new course on Chinese?” Jim asked his teacher. => Jim asked his teacher 3) Joana couldn’t decide when she should start her journey. => Joana couldn’t decide 4) “You must stay in bed until next Monday!” the doctor said. => The doctor said
cho m gam natri vào nước thu dược 1,5 lít dung dịch có ph= 13 tính m
Exercise 2: Complete the sentences with suitable WH - question words. 6) The rules didn’t specify speak to in case of an emergency. 7) You need to find out to overcome stress and worry. 8) I don’t know to turn to for help. 9) I had no idea to write my home paper about. 10) Tell me to press the button.
Tại sao SGK lại chọn bài tự tình 2 mà phải phải tự tình 1 ?
Exercise 2: Complete the sentences with suitable WH - question words. 1) He doesn’t know to ask for advice about this situation. 2) Be sure to eat when you arrive in Vietnam. 3) They are going to tell me to do to survive in a storm. 4) I asked Jane to show me to deal with bullying at school. 5) He wondered to start revising for the final exam.
Exercise 1: Rewrite the following questions in reported speech, using question words before to-infinitives. 6) ‘Who should I turn to for help?’ he asked. => 7) ‘Mum, when should I turn off the oven?’ Mai asked her mother. => 8) ‘Where should we park our bikes?’ asked Phong and Minh. => 9) ‘Should we call her now?’ he asked. => 10) ‘What should we do to make Linh feel happier?’ they wondered. =>
Vẽ hình chiếu và số đo của hình sau:
call: "team dép lào" chủ đề trung thu calli bằng app
giúp mk câu a,c,e này vs chi tiết nhé nhớ kẽ BBT
Exercise 1: Rewrite the following questions in reported speech, using question words before to-infinitives. 1) ‘What should we do to help her overcome stress?’ => They didn’t know 2) ‘Should I discuss this matter with my teammates?’ => Jonas wondered 3) ‘Where should I register for a course on life skills?’ => An asked Mary 4) ‘When should we start our campaign?’ => They had no idea 5) ‘How should we use this support service?’ they wondered.
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