áp dụng tính chât của phepf tính chia hết cho 8: 24+26
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Ex15: Complete the second sentence so that it has the same meaning as the first.
1. The school has a computer room and a library.
→ There______is a computer room and a library in my school________________________________________________________________
2. My house has five rooms.
→ There__are five rooms in my house_____________________________________________________________
3. There isn’t a telephone in the living room.
→ We don't have a telephone in the living room
4. The house is behind the trees.
→ There are trees in front of the house
5. Mai’s house is in front of her school.
→ Mai’s school is behind her house______________________________________________________________
6. The bus station isn’t far from the new shopping center.
→ The bus station is near the new shopping center
7. I like the kitchen most.
→ My favourite___room is the kitchen____________________________________________________________
8. Hoa has a new school bag.
→ ___Hoa's schoolbag__________________is new.
1,Phong, Duy and Vy usually walk to school.
2,Kelvin rarely reviews the lesson in the morning.
3,The streets are always crowded at this time of the day.
4,They often don't do exercise at the weekends.
5,I sometimes forget to turn off the lights before leaving the room
EX 13
1. DO PHONG,DUY AND VY USUALLY WALK TO SCHOOL?
2.KELVIN RARELY REVIEWS THE LESSON IN THE MORNING.
3.THE STREETS ALWAYS CROWDED AT THIS TIME OF THE DAY.
4.THEY OFTEN DON'T DO EXERCISE AT THE WEEKENDS.
5.SOMETIMES,I FORGET TURN OFF THE LIGHT BEFORE LEAVING THE ROOM.
= 4.x+x=55-15
=4.x+x=40
=x(4+1)=40
=x.5=40
=x=40:5
=x=8
Chúc bạn học tốt ^^
EX10.
1.HE LIVE IN AN APARTMENT IN HO CHI MINH CITY.
2.HE LIVE WITH HIS PARENTS.
3.NO, THERE ISN'T.
4.HE OFTEN PUT HIS SCHOOL BAG AND SCHOOL THINGS IN HIS DESK
5.NO, IT ISN'T.
6.IS THE DESK.
EX.11
1.B
2.B
3.C
4.B
5.B
Chúc bạn học tốt @GOJO SATORU
\(5n+12⋮n-5\)
=>\(5n-25+37⋮n-5\)
=>\(37⋮n-5\)
=>\(n-5\in\left\{1;-1;37;-37\right\}\)
=>\(n\in\left\{6;4;42;-32\right\}\)
mà n>=0
nên \(n\in\left\{6;4;42\right\}\)
`5n + 12 ⋮ n - 5`
`=> 5n - 25 + 37 ⋮ n - 5`
`=> 5(n - 5) + 37 ⋮ n - 5`
Do `n+5 ⋮ n - 5 `
`=> 5(n+5) ⋮ n - 5`
`=> 37 ⋮ n - 5`
`=> n - 5` thuộc `Ư(37) =` {`-37;-1;1;37`}
`=> n` thuộc {`-32;4;6;42`}
Mà `n` thuộc `N`
`=> n` thuộc {`4;6;42`}
Vậy ...
\(\overline{abc0cd}\\ =a\cdot100000+b\cdot10000+c\cdot1000+0\cdot100+c\cdot10+d\\ =a\cdot10^5+b\cdot10^4+c\cdot10^3+0\cdot10^2+c\cdot10+d\)
\(\overline{abc0cd}=a\cdot10^5+b\cdot10^4+c\cdot10^3+0\cdot10^2+c\cdot10+d\)
\(=a\cdot10^5+b\cdot10^4+c\left(10^3+10\right)+d\)
a: \(11^2=11\cdot11=121;111^2=12321\)
b: Dự đoán: \(1111^2=1234321\)
Tính: \(1111^2=1111\cdot1111=1234321\)
Luỹ thừa | Cơ số | Số mũ | Giá trị của luỹ thừa |
|
72 | 7 | 2 | 49 |
|
26 | 2 | 6 | 64 |
|
54 | 5 | 4 | 625 |
|
1n | 1 | n | 1 |
8 : 24 + 26 = \(\dfrac{1}{3}\) + 26 = \(\dfrac{1}{3}\) + \(\dfrac{78}{3}\) = \(\dfrac{79}{3}\)