(-69) x I -45 I - 31 . I 45 I
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TG
16 tháng 1 2019
Bài 6: Thực hiện phép tính
a)(-18)-(-3)-12
= (-18) + 3 - 12
= (-15) - 12
= - 3
b)85.(35-27)-35.(85-27)
= 85. 8 - 35. 58
= 680. 2030
= 1380400
c)(-45).69+31.(-45)
= (-45) . (69 + 31)
= (-45) . 100
= - 4500
Bài 7:Tìm x thuộc Z, biết:
a)(2-x)+10=-14
2-x = 14 - 10
2-x = 4
x = 2 - 4
x = - 2
b)14.|x|=28
|x| = 28 : 14
|x| = 2
⇒ x ϵ {2;-2}
19 tháng 6 2020
Bài 1: Tính nhanh:
a) (2354 - 45) - 2354 = 2354 - 45 -2354 =2354-2354-45=0-45=-45
b) (16 + 23)+(153-16- 23)=16+23+153-16-23=(16-16)+(23-23)+153=153
c) (-2009) - (234 - 2009)=-2009-234+2009=-2009+2009-234=-234
d) (134 -167 + 45) - (134 + 45)=134-167+45-134-45=(134-134)+(45-45)-167=-167
Bài 2: Tìm số nguyên x, biết:
a) 3 - x = 15 - (-5)
3 - x =20
x=3-20
x=-17
b) x + (-31) - (-42) = -45
x - 31 + 42 =-45
x - 31 =-45-42
x - 31 = -87
x =-87+31
x= -56
25 tháng 2 2022
Sure. Simple task.
A bad summer vacation
As the bus turned the corner, I saw my hotel at the end of the road. I started running towards the hotel as fast as I can. Unfortunately, there was a terrible traffic jam and the traffic light turned red. I was panicking. Finally, I reached the hotel and I felt guilty when my friends had already arrived there and they had been waiting for me a long time. We went straight to the main hall when a manager blocked our way. He told us: 'Sorry madam, but when I checked the security camera there were a couple of robbers went inside.' I asked my friends whether anyone was inside when Alex said: 'Oh God, I forgot to lock the door while we're away from room.' I was nervous to hear this, and they made my blood boil. We ran towards the elevator and went to our apartment. Just what the manager said, a couple of thieves ran out. Luckily, they didn't rob anything but they ruined our room! What a horrible mess!
The next day, we received an invitation from this fabulous hotel. They were inviting us to a fashion party. We decided to buy some fashional clothes to join. My friends were going to buy it, while I stayed at home and chose my favour. I ordered online and got my credit card. It was for sale. My friends went home with their favourite style but my order wasn't completed. Then an email suddenly was sent to me, and it said: Can't finish the order, the road was blocked until the maintenance is over. My friends laughed and I wasn't attending the party in the following evening!
( This is a realis story )
19 tháng 2 2020
-69. | -45 | - 31 . | 45|
= -69 . 45 - 31 . 45
= 45 ( -69 - 31)
= 45. (-100)
= -4500
hok tốt!
TN
21 tháng 9 2017
1;
31.(45+69)+69.(45-31)
=31.45+69.31+69.45-69.31
=45.(69+31)+(69.31-69.31)
=45.100+0
=4500
2;
A=2x+3y+9x+8y
=>A=x.(2+9)+y.(8+3)
=>A=11x+11y
=>A=11.(x+y)mà x+y =10
=>A=11.10
=>A=110
DN
21 tháng 9 2017
Bài 1 .
31 . ( 45 + 69 ) + 69 . ( 45 - 31 )
= 31 . 45 + 69 . 31 + 69 . 45 - 69 . 31
= 45 . ( 69 + 31 ) + ( 69 . 31 - 69 . 31 )
= 45 . 100 + 0
= 4500
Bài 2 .
Ta có : A = 2x + 3y + 9x + 8y
\(\Rightarrow\) A = x . ( 2 + 9 ) + y . ( 3 + 8)
\(\Rightarrow\) A = 11x + 11y . Mà x + y = 10 nên :
\(\Rightarrow\) A = 11 . 10
\(\Rightarrow\) A = 110
Vậy A = 110
PN
0
NV
2
25 tháng 12 2016
45 - | - 27 - ( - 25 ) - x | = 20
45 - | - 27 + 25 - x | = 20
45 - | 2 - x | = 20
| 2 - x | = 45 - 20
| 2 - x | = 25
=> * Nếu 2 - x = 25 => x thuộc rỗng
* Nếu 2 - x = - 25 => x = - 25 - 2 = - 27
=> x thuộc { - 27 }
NT
25 tháng 12 2016
45-|-27-(-25)-x|=20
|-27-(-25)-x|=45-20
|-27-(-25)-x|=25
|-2-x|=25
x=-2-25
x=-27
(-69)x|-45|-31x|45|
=(-69)x45-31x45
=45x[(-69)-31]
=45x(-100)
=-4500
\(\left(-69\right)\times\left|-45\right|-31\times\left|45\right|\)
\(=\left(-69\right)\times45-31\times45\)
\(=45\left(-69-31\right)\)
\(=45\times100\)
\(=4500\)