Đáp án:
Giải thích các bước giải:
`1)`
`x\ge4`
`=>x-4\ge0`
`\sqrt{(x-4)^2}`
`=|x-4|`
`=x-4`
`2)`
`x<5`
`=>x-5<0`
`=>5-x>0`
`\sqrt{(5-x)^2}`
`=|5-x|`
`=5-x`
`3)`
`x\ge-1`
`=>x+1\ge0`
`\sqrt{x^2+2x+1}`
`=\sqrt{(x+1)^2}`
`=|x+1|`
`=x+1`
`4)`
`x<1/3`
`=>x-1/3<0`
`=>3x-1<0`
`\sqrt{9x^2-6x+1}+3x`
`=\sqrt{(3x-1)^2}+3x`
`=|3x-1|+3x`
`=1-3x+3x`
`=1`
Đáp án + Giải thích các bước giải:
Bài 1:
\(1)\\ \sqrt{(x-4)^2}=|x-4|=x-4\quad \text{(với $x\geq 4$)}\\ 2)\\ \sqrt{(5-x)^2}=|5-x|=5-x\quad \text{(với $x< 5$)}\\ 3)\\ \sqrt{x^2+2x+1}=\sqrt{(x+1)^2}=|x+1|=x+1\quad \text{(với $x\geq -1$)}\\ 4)\\ \sqrt{9x^2-6x+1}+3x\\ =\sqrt{(3x-1)^2}+3x\\ =-(3x-1)+3x\quad \text{(với $x<\dfrac{1}{3}$)}\\ =-3x+1+3x\\ =1\)
làm câu 2,3 nhé cảm ơn bạn nào giúp
word là phần mềm gì A. phần mềm soạn thảo B. phần mềm tính toán C. phần mềm vẽ D. phần mềm thiết kế đồ họa
Rút gọn biểu thức : `A = (x^2– 1)(x^2+ x + 1)(x^2– x + 1)`
Change the following senteces from diect to reported speech
Choose the sentence (A, B, C or D) which has closest meaning to the one given. 46. Have you got any better hat than this one? A. Is this one the worse hat you’ve got? B. Is this one the best hat you’ve got? C. Is this one the better hat than this one? D. Is that one the better hat than this one? 47. This is the most luxurious house I’ve ever seen. A. I’ve never seen a more luxurious than this. B. I’ve never seen the most luxurious house than this. C. I’ve seen a more luxurious house than this. D. I’ve seen a more luxurious house than this. 48. He was the cleverest thief of all times. A. All thieves are cleverer than him. B. All thieves are less clever than him. C. No thieves are clever except for him. D. No thieves are less clever than him.
Giúp tớ bài 2+3 đc ko ạ :)? Nếu đc thì tớ cám ơn ạ 😍
Giúp mình nha Complete the sentences with the correct form of the verb in brackets 1. The guitarist would like ______ (play) in a famous band. 2. The photographer hopes _______ (take) some good pictures of the mountains today. 3. The actor is very good at ______ (show) how he feels. 4. The artist thinks it is difficult _______(find) a good place to have an exhibition of her art. 5. The journalist is interested in _______ (write) an article about circus children. 6. The dancer enjoys _______ (practice) his dance outside. 7. The drummer doesn't mind ______ (sit) behind the other musicians in the band.
Chọn đáp án đúng. Tứ giác QPXZ là hình bình hành và O là giao điểm của hai đường chéo nếu: I. Góc QZX = góc PXZvà QZ // PX II. QX = PZ và QP = XZ III. PO = OZ và PZ = PX IV. QO = OX và PO = OZ
Nhanh nha mọi người giúp mình vs mik đg cần
mình đang cực gấp lun ý giúp mk vs nhớ gaiir thick nhá
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