p=2

nha kb nha

thanks

số nguyên tố p là 3

x có thuộc số tự nhiên ko[xcos thuộc N ko

nếu x thuộc N thì x=0

nếu đúng k mình nhé

hình như bạn sai đề

Ta có : 3^{x - 2} + 3^x = 90

<=> 3^{x - 2} + 3^x = 3⁴ + 3²

Vậy x = 2

4 do bn 

nho k minh nhe

minh chac chan dung

vì 4a + 5b +6c chia hết cho 11 nên a +b +c chia het cho 11

a+b+c chia hết cho 11 nên a chia hết cho 11,b chia hết cho 11 và c chia hết cho 11\(\Rightarrow\)5a+9b+6c chia hết cho 11

Vì 4a+5b+6c chia hết cho 11

=> 6c chia hết cho 11

Ta có:

[3.(5a+9b)+6c]-(4a+5b+6c)=11a+11b+0 chia hết cho 11(vì 6c chia hết 11)

Vậy khi 4a+5b+6c chia hết cho 11 thì 5a+9b+6c chia hết cho 11

1. Do this sign says " stop " ?

This sign don't says '' stop '' .

2. Is Mr quang eating his breakfast at a foodstall now ?

Mr Quang isn't eating his breakfast at a foodstall now

3. Does she travel to work by motorbike every morning ?

She doesn't travel to work...

4. Is he unloading ... "

He isn't unloading ...

1.(-)This sign doesn't say "Stop"

   (?)Does this sign say "Stop"?

2.(-)Mr.Quang isn't eating his breakfast at a foodstall now.

   (?)Is Mr.QUang eating his breakfast at a foodstall now?

3.(-)She doesn't travel to work by motorbike every moring.

   (?)Does she travel to work by motorbike every moring?

4.He isn't unloading the vegetable at the market now.

   Is he unloading the vegetable at the market now?

5.That sign doesn't say"NO TURNING RIGHT"

  Does that sign say "NO TURNING RIGHT"?

6.That man isn't going into the one-way street.

  Is that man going into the one-way street?

TIỆN THỂ MK GÓP Ý LUÔN VS BN VŨ NGỌC MAI:THIS SIGN LÀ SỐ ÍT NÊN DÙNG DOESN'T CHỨ KO DÙNG DON'T NHA

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~HỌC TỐT~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

4,He is listening to the radio

2,They are paying soccer too

6,What is he doing at the foodstall?

UCLN(20;30;40) là 10

BCNN(120;150) là 600

phan h ra thua so nguyen to ta duoc:20=2².5;30=2.3.5;40=2³.5

=>ưcln=2.5=10

120=2³.3.5;150=2.3.5²=>bcnn=2³.3.5²=600