HAY CHUNG MINH
4:3=2
chứng minh45-83+26chia hết cho 9
giúp mình nhé
thanks
cho mình lời giải
Dễ mà , Khoa
4^5 - 8^3 + 2^6
=(2^2)^5 - (2^3)^3 + 2^6
=>2^10 - 2^9 + 2^6
=2^1+2^6
=2+64
=66
=> không chia hết cho 9
Chắc vậy
Mình thấy hơi khó nhìn một chút , bạn thông cảm nha
Ta có : 45 - 83 + 26
= 1024 - 728 + 64
= 296 + 64
= 360
Mà 3 + 6 + 0 = 9 chia hết cho 9 => đpcm
Vậy 45 - 83 + 26 chia hết cho 9
Hok tốt
Ta có : 45 - 83 + 26 = (22)5 - (23)3 + 26
= 210 - 29 + 26
= 1024 - 512 + 64
= 512 + 64
= 576
ta có : 576 chia hết cho 9 vì 576 = 5+7+6 = 18
mà 18 chia hết cho 9
vậy 45 - 83 + 26 chia hết cho 9
Dùng cấu trúc với too hay either để điền vào chỗ trống.
1. We often go swimming in the summer, and they
2. She can speak English very well. I
3. Nam didn’t come to the party last night, and Minh
4. Hoa will buy some oranges and pineapples. I
5. They don’t want to go out tonight, and we
6. The pineapples aren’t ripe, and the bananas
7. Nam is hungry and his friends
8. Jane won’t come. Peter
9. Hoa had a medical check-up yesterday morning. We
10. He can’t swim and his brother
1. We often go swimming in the summer, and they do, too.
2. She can speak English very well. I can, too.
3. Nam didn’t come to the party last night, and Minh didn’t, either.
4. Hoa will buy some oranges and pineapples. I will, too.
5. They don’t want to go out tonight, and we don’t, either.
6. The pineapples aren’t ripe, and the bananas aren’t, too.
7. Nam is hungry and his friends are, too.
8. Jane won’t come. Peter won’t, either.
9. Hoa had a medical check-up yesterday morning. We did, too.
10. He can’t swim and his brother can’t, either.
1. We often go swimming in the summer, and they..........do too.........
2.She can speak English very well. I..........can too....................
3.Nam didn’t come to the party last night, and Minh....didn't either....
4.Hoa will buy some oranges and pineapples. I....will too.....
5.They don’t want to go out tonight, and we.....don't either.....
6.The pineapples aren’t ripe, and the bananas..........aren't either....................
7.Nam is hungry and his friends........is too............................
8.Jane won’t come. Peter............won't either...........................
9.Hoa had a medical check-up yesterday morning. We......did too.........
10.He can’t swim and his brother........can't either..................................
chứng minh4=5
-20 = -20
<=> 25 - 45 = 16 - 36
=> 5^2 - 2.5.9/ 2 = 4^2 - 2.4.9/2
Cộg cả 2 vế với (9/2)^2 để xuất hiện hằg đẳg thức :
5^2 - 2.5.9/2 + (9/2)^2 = 4^2 - 2.4.9/2 + (9/2)^2
<=> (5 - 9/2)^2 = (4 - 9/2 )^2
=> 5 - 9/2 = 4 - 9/2
=> 5 = 4
IV. Dùng cấu trúc với too hay either để điền vào chỗ trống.
1. We often go swimming in the summer, and they
2. She can speak English very well. I
3. Nam didn’t come to the party last night, and Minh
4. Hoa will buy some oranges and pineapples. I
5. They don’t want to go out tonight, and we
6. The pineapples aren’t ripe, and the bananas
1. We often go swimming in the summer, and they do, too.
2. She can speak English very well. I can, too.
3. Nam didn’t come to the party last night, and Minh didn’t, either.
4. Hoa will buy some oranges and pineapples. I will, too.
5. They don’t want to go out tonight, and we don’t, either.
6. The pineapples aren’t ripe, and the bananas aren’t, too.
1)Tìm các số nguyên dương x:y:z sao cho: x+y+z=xyz
2) Biết n là số nguyên không chia hết cho 2 và 3; chứng minh42n+3n+5 chia hết cho 6
Do vai trò bình đẳng của x, y, z trong phương trình,
trước hết ta xét x ≤ y ≤ z.
Vì x, y, z nguyên dương nên xyz ≠ 0, do x ≤ y ≤ z
=> xyz = x + y + z ≤ 3z => xy ≤ 3=> xy thuộc {1 ; 2 ; 3}.
Nếu xy = 1 => x = y = 1,
thay vào (2) ta có : 2 + z = z, vô lí.
Nếu xy = 2, do x ≤ y nên x = 1 và y = 2,
thay vào (2), => z = 3.Nếu xy = 3,
do x ≤ y nên x = 1 và y = 3,
thay vào (2), => z = 2.
Vậy nghiệm nguyên dương của phương trình (2) là các hoán vị của (1 ; 2 ; 3)
phần kia thì chịu :)
hay chung minh 4:3=2
Ta có : 4 / 3 là tứ / tam ( từ hán việt )
mà tứ / tam là tám : tư ( nói lái )
=)) 8 / 4 = 2
=)) 4 / 3 = 2
T ik nha bạn =))
Chúc bạn học tốt nhé !!!
4:3=2
bốn chia ba=tứ chia tam=2
mình làm vậy có đúng ko
hay chung minh 4:3=2
4: 3 = tứ : tam = tám : tư = 8 : 4 = 2
**** dùm mình nha
Hay chung minh A=2^2+2^3+...+2^9+2^10 chia hết cho 3
cho B= 2+3^2+3^3+.......+3^20 hay chung to 2B la luy thua cua 3