45-59+(-45)+55
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LC
28 tháng 11 2021
a) ( 128,4 - 73,2 ) : 2,4 + 18,32 = 55,2 : 2,4 + 18,32 = 23 + 18,32 = 42,32
b) 210 : x = 14,92 - 6,52
210 : x = 8,4
x = 210 : 8,4
x = 25
c) mình không biết xin lỗi bạn nha
k cho mình nha, yên tâm mình được việc lắm ( uy tín )
2 tháng 6 2017
- \(=\left(-23+27-13+47-23+37-13+47\right):45\)\(=\left(-23.2-13.2+27.2+47.2\right):45=\left(-72+148\right):45=\frac{76}{45}\)
- \(=59:\left(111-522+115-23\right)=59:\left(-319\right)\)
18 tháng 2 2021
Make question for the underlined part of each sentence.
1. Marry moved to her new house 5 months ago.
=> When did Marry move to her new house ?
2. The airplane takes off at 6 p.m. tomorrow.
=> When does The airplane take off?
3. James is helping an old man cross the road.
=> Who is helping an old man cross the road?
4. The children visit their grandparents every two months.
=> How often do The children visit their grandparents?
5. My mother is always complaining about my untidiness.
=> What is your mother always complaining about ?
6. The couple has sent a letter to their daughter.
=> What has The couple sent to their daughter?
7. Many people are queuing in front of the shop because a hot item is on sale.
=> Why are Many people queuing in front of the shop?
8. They have watched this movies three times.
=> How many times have they watched this movies ?
9. I often learn a new word by making sentences with it.
=> How do you often learn a new word ?
10. This dress costs me $100 to buy
=> How much this dress cost you to buy ?
MV
18 tháng 10 2021
(2x-3)2 - 2(2x-3)(2 - x) + (x-2)2
= (2x-3)2 - (2x-3)(2 - x) - (2x-3)(2 - x ) - (2 - x)2
= (2x-3)(3x - 5) - (2-x)(3x - 5)
= (3x - 5)2
MV
18 tháng 10 2021
Ui mình sai.
Sửa :
(2x-3)2 - (2x-3)(2-x) + (x-2)2
= (2x-3)2 - (2x-3)(2-x) + (2-x)2
= (3x-5)(2x-3) + (3x-5)(2-x)
= (3x-5)(x -1)
H9
HT.Phong (9A5)
CTVHS
31 tháng 7 2023
a) \(-524\cdot\left[23+\left(-45\right)\right]+524\cdot\left(-45+123\right)\)
\(=-524\cdot\left[\left(23-45\right)-\left(-45+123\right)\right]\)
\(=-524\cdot\left(23-45+45-123\right)\)
\(=-524\cdot-100\)
\(=52400\)
b) \(47\cdot69-31\cdot\left(-47\right)\)
\(=-47\cdot\left(-69-31\right)\)
\(=-47\cdot-100\)
\(=4700\)
c) \(16\left(38-2\right)-38\left(16-1\right)\)
\(=16\cdot38-16\cdot2-38\cdot16+38\)
\(=-16\cdot2+38\)
\(=-36+38\)
\(=2\)
d) \(\left(-41\right)\cdot\left(59+2\right)+59\cdot\left(41-2\right)\)
\(=-41\cdot59-41\cdot2+41\cdot59-2\cdot59\)
\(=-41\cdot2-2\cdot59\)
\(=-2\left(41+59\right)\)
\(=-2\cdot100\)
\(=-200\)
e) \(25\cdot\left(-8\right)\cdot\left(-25\right)\cdot9\cdot4\cdot100^0:3\)
\(=\left(-1000\right)\cdot\left(-25\right)\cdot9\cdot4\cdot1:3\)
\(=25000\cdot9\cdot4:3\)
\(=25000\cdot3\cdot4\)
\(=100000\cdot3\)
\(=300000\)
= - 4
\(=\left[45+\left(-45\right)\right]+\left(-59+55\right)\\ =0+\left(-4\right)=-4\)