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18 tháng 1 2019
<=>|3x-3|+2x+1=3x+1 <=>|3x-3|=x <=>3x-3=x hoặc 3x-3=-x <=>2x=3 hoặc 4x=3 <=>x=3/2 hoặc x=3/4
20 tháng 2 2017

a) Bạn adct \(\left|x\right|+\left|y\right|\ge\left|x+y\right|\)

Ta cóA= \(\left|x-7\right|+\left|x+5\right|=\left|7-x\right|+\left|x+5\right|\ge\left|7-x+x+5\right|\)

=> \(\left|7-x\right|+\left|x+5\right|\ge12\) vậy minA=12

20 tháng 2 2017

b)Ta có \(\left(2x-1\right)^2-3\left|2x-1\right|+2=\left|2x-1\right|^2-2\left|2x-1\right|.\frac{3}{2}+\frac{9}{4}-\frac{1}{4}=\left(\left|2x-1\right|-\frac{3}{2}\right)^2-\frac{1}{4}\)=>minA=-1/4

1 tháng 3 2020

\(\Leftrightarrow\left|\left(x-y+1\right)^2+x-2\right|=2x-\left|\left(x-1\right)\left(x-2\right)\right|\)

\(\left|\left(x-2\right)\left(x-1\right)\right|\ge0\Rightarrow\left[{}\begin{matrix}x\le1\left(1\right)\\x\ge2\left(2\right)\end{matrix}\right.\)-Trường hợp (1) có PT:

\(x-2\ge0\Rightarrow\left(x-y+1\right)^2+x-2>0\)..PT trở thành

\(\left(x-y+1\right)^2+x-2+4=2x-\left(x^2-3x+2\right)\)

\(\Leftrightarrow2x^2-2xy+y^2-4x-2y+5=0\)

Giải nữa thì nhờ mk nha

17 tháng 10 2021

a: Ta có: \(\left(2x-1\right)^2-2\left(2x-3\right)^2+4\)

\(=4x^2-4x+1-2\left(4x^2-12x+9\right)+4\)

\(=4x^2-4x+5-8x^2+24x-18\)

\(=-4x^2+20x-13\)

b: \(\left(3x+2\right)^2+2\left(3x+2\right)\left(1-2y\right)+\left(1-2y\right)^2\)

\(=\left(3x+2+1-2y\right)^2\)

\(=\left(3x-2y+3\right)^2\)

21 tháng 10 2021

a: \(\left(2x-1\right)^2-2\left(2x-3\right)^2+4\)

\(=4x^2-4x+1+4-2\left(4x^2-12x+9\right)\)

\(=4x^2-4x+5-8x^2+24x-18\)

\(=-4x^2+20x-13\)

e: \(\left(2x+3y\right)\left(4x^2-6xy+9y^2\right)=8x^3+27y^3\)

B/ Mid – Autumn FestivalThere are hundreds of festival in Vietnam each year. (1)………., Tet holiday, the Mid- Autumn festival is one of the most famous festival and it is a traditional celebration for Vietnamese (2)…………The Mid – Autumn Festival is (3)………….. on the 15th day on the 8th lunar month ( often in late Semtember or early October) in the middle of Autumn and it is celebrated for a whole day. On this day , the adults and the parents prepare a special cake called moon cake along with many...
Đọc tiếp

B/ Mid – Autumn Festival

There are hundreds of festival in Vietnam each year. (1)………., Tet holiday, the Mid- Autumn festival is one of the most famous festival and it is a traditional celebration for Vietnamese (2)…………

The Mid – Autumn Festival is (3)………….. on the 15th day on the 8th lunar month ( often in late Semtember or early October) in the middle of Autumn and it is celebrated for a whole day. On this day , the adults and the parents prepare a special cake called moon cake along with many candies, jellies, grapefruit, bananas, apples, etc. Tha Mid- autumn celebration is an opportunity (4) …………………. Family members to reunite. Young people express their gratitude to the elderly.

Question 1: A. and         B. therefore         C. besides         D. so

Question 2: A. children         B. child         C. girls         D. boys

Question 3: A. held         B. remembered          C. taken         D. done

Question 4: A. on          B. for         C. in         D. at

1
19 tháng 12 2022

1C

2A

3A

4B