chẳng ai giúp mình cả buồn quá!!!

các bạn ko giải cho mình thì mình tự giải vậy,đúng là khi hỏi bạn chỉ nhận đc 1 câu trả lời nhưng khi chịu suy nghĩ và tự làm thì bạn nhận đc gấp bội:

1)vì b^2 ko bao giờ có số tận cùng là 8 mà 10^a =168 có tận cùng bằng 8 nên suy ra a chỉ có thể bằng 0 và 1+168=169=13^2

2)35^x +9 chắc chắn sẽ có chữ số tận cùng là 4 .mà 5^y thì kiểu gì cũng có tận cùng là 5 đem nhân 2 ta đc tận cùng là 0 suy ra x chỉ có thế bằng 0 vậy 1 +9=10 mà 5.2=10 nên y=1 và x=0

3)7^b chỉ có tận cùng là số lẻ,mà chẵn cộng chẵn sẽ bằng chẵn nên a chỉ có thể bằng 0 và 342+1=343=7^3 suy ra a=0 và b=3

chúc các bạn học tốt :)))

Ta có:         A = b . ( a - c ) - c . ( a - b )

                      = ab - bc - ac + bc 

                      = ab - ( bc - bc ) - ac            

                      = ab - 0 - ac

                      = ab - ac

                      = a ( b - c )           ( 1 )

       Thay a = - 20; b - c = - 5 vào ( 1 ) ta có:

                       C = a ( b - c )

                          = ( - 20 ) ( - 5 )

                          = 100

       Vậy  A = 100

gửi lời cảm ơn chân thành đến bạn Công Chúa Giá Băng

100

mình xong đầu tiên mà!

ờ thế hả

????????

Yuk oki  pn

96+4=100

4 + 96 = ?

4 + 96 = 96 + 4

          = 100 

mk kết bn rồi đó ! mk nhanh nhất nha tk mk đi !

4+96=100

k

Tk nhá

Chúc bn hok giỏi

Có j chán thì tới gặp mk

Buồn thì lại đây tâm sự

Hết thì chuyển chủ đề

Để nói tiếp

5 giờ 20 phút= \(\frac{16}{3}\) giờ

Đổi 5 giờ 20 phút = ... giờ

 DDooir :

5 giờ 20 phút = 5,333....giờ

5 giờ 20 phút = \(\frac{16}{3}\)giờ

bằng 5 20/60 giờ = 5 2/6 giờ = 32/6 giờ

A=0,(1).5+0,(4)

  =0,(5)+0,(4)

  =5/9+4/9

  =9/9=1

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5 + 55 = 60 

kb rồi đấy

5 + 55 = 60 nha bn

5 + 55 = 60 nhaNina Thiên Thần

Chúc bạn thi tốt.

Nếu được giải nhất càng tốt.

Chúc bn thi tốt. Nhớ cố gắng hết sức để đạt giải cao nhé

cảm ơn bạn nhé