Mình cần gấp lắm ! Mọi người giúp mình với nha
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giúp mình nha mọi người mình cần gấp lắm
DN
3
AH
Akai Haruma
Giáo viên
30 tháng 10 2021
Bài 1:
a. $=2x(x-3)$
b. $=x^3(x+3)+(x+3)=(x^3+1)(x+3)=(x+1)(x^2-x+1)(x+3)$
c. $=64-(x^2-2xy+y^2)=8^2-(x-y)^2$
$=(8-x+y)(8+x-y)$
AH
Akai Haruma
Giáo viên
30 tháng 10 2021
Bài 2:
$(x+5)(x+1)+(x-2)(x^2+2x+4)-x(x^2+x-2)$
$=x^2+6x+5+(x^3-2^3)-(x^3+x^2-2x)$
$=x^2+6x+5+x^3-8-x^3-x^2+2x$
$=8x-3$
Ta có đpcm.
PT
Mọi người giúp mình với. Mình cần gấp lắm!!
0
14 tháng 1 2022
d: =-100+720/718
=-35540/359
e: \(=5^3-9\cdot16=125-144=-19\)
f: \(=8\cdot9-7^2+7=72+7-49=30\)
TV
0
2 tháng 9 2021
b: Ta có: \(\left(x+y\right)^2-x^2+4xy-4y^2\)
\(=\left(x+y\right)^2-\left(x-2y\right)^2\)
\(=\left(x+y-x+2y\right)\left(x+y+x-2y\right)\)
\(=3y\cdot\left(2x-y\right)\)
c: Ta có: \(\left(x+y\right)^3-\left(x-y\right)^3\)
\(=x^3+3x^2y+3xy^2+y^3-x^3+3x^2y-3xy^2+y^3\)
\(=2y^3+6x^2y\)
\(=2y\left(3x^2+y^2\right)\)
6 How do they travel to work?
7 Who speaks French very well?
8 What makes people different from all other animals?
IV
1 Because Nathan missed the bus, he was late for school
2 Keep the food covered or the flies will contaminate it
3 Julie hadd a guitar and she plays it very well
4 I need to study hard so I can get a good score on the test
5 Although he seemed a friendly person, I didn't like him
6 The food looks delicious but it tastes horrible
7 Mason fell because the floor was wet
8 Anna needed some money so she took a part-time job
1/ Nathan missed the bus because he was late for school.
2/Keep the food covered or the flies will contaminate it.
3/Julie has a guitar and she play it very well.
4/I need to study hard so I can get a good score on the test.
5/Although he seemed a friendly,I didn't like him.
6/The food looks deliciou but it tastes horribie.
7/ Mason fell because the floor was wet.
8/Anna took a part-time job so she needed some money.