x+50=120-5

x+50=115

x      = 65

vậy: x=65.

bạn tk mk nha.

x+50=120-5

x+50=115

x=115-50

x=65

\(x+50=120-5\)

\(x+50=115\)

\(x=115-50\)

\(x=65\)

Sao bạn không chụp phần Tim's letter luôn?

Dear Tim,
Hi! How are you doing? I am very glad to hear from you. In my country, we have many vacations such as Tet holiday, summer vacations,.... Let me tell about it.

Tet is often held between late January and early February. Tet holiday begins with the first day of January in the Lunar Year. Normally, it lasts for 5 days.

On the first day of New Year, we usually go to pagoda first to pray for good things for the coming new year. After that, we visit our relatives to give them best wishes of happiness, health and success.

In my opinion, Tet is the most enjoyable vacation in Vietnam. If you have chance to visit Vietnam on Tet, I am sure that you will like this holiday.

Sincerely,

Nhi

 

3.

a. plays

b. will call

c. will be

d. ko thấy rõ

e. learns

f. is going to invite

g. go

h. will have

24,5+x*5=100 

=>5x=75,5

=>x=15,1

x*3-76,3=15,2

=>3x=91,5

=>x=30,5

ai tích mk mk sẽ tíc lại

nao ai iup minh voi

lam the nao de duoc 75,5

ban lay cai nao tru cai nao day

một cốc sữa

một ly nước trái cây

 một ly coca

một cốc sữa

một ly nước trái cây

một ly coca

A glass of milk: Một cốc sữa

A glass of juice:Một cốc nước ép

A glass of coca:Một cốc coca

Chúc bn học tốt^^

(37-17)*(-5)+23*(-13-17)

= 20*(-5)+23*-30

=-100+-690 =-790

ko biết đúng ko nếu đúng tich cho mk nha @Doi do tra my !!

(37-17).(-5)+23.(-13-17)

=20.(-5)+23.(-30)

=(-100)-(-690)

=-790

ai tra loi dung min tink cho nhe

Thấy tội nghiệp wá nên giải thui !! chế dễ ợt ko bõ phủi tay :))

\(5xy+x-10y=14\)

\(\Leftrightarrow5y\left(x-2\right)+x=14\)

\(\Leftrightarrow5y\left(x-2\right)+\left(x-2\right)=12\)

\(\Leftrightarrow\left(5y+1\right)\left(x-2\right)=12\)

\(\Rightarrow5y+1\) và \(x-2\) là ước của 12

Ta có \(Ư\left(12\right)=\left\{-12;-6;-4;-3;-2;-1;1;2;3;4;6;12\right\}\)

Vì \(5y+1\) là ước của 12 mà y nguyên nên \(5y+1\in\left\{-4;1;6\right\}\) 

Với \(5y+1=6\) thì \(x-2=2\) => \(y=1\) thì \(x=4\)

Với \(5y+1=-4\) thì \(x-2=-3\) => \(y=-1\) thì \(x=-1\)

Với \(5y+1=1\) thì \(x-2=12\) => \(y=0\) thì \(x=14\)

Vậy \(\left(x;y\right)=\left\{\left(4;1\right);\left(-1;-1\right);\left(0;14\right)\right\}\)

Thánh Đinh Đức Hùng làm hay quá

add a correct question tag to each sentence:

1.You have heard about that, haven't you ?

2.Nam did the work well, didn't he ?

3.He didn't have to speak to me, did he ?

add a correct question tag to each sentence:

1.You have heard about that;...........haven't you?....................

2.Nam did the work well;................didn't he?.................

3.He didn't have to speak to me;...............did he?..............

Câu 1 thi min biet lam roi ,xin m.n giup min cac câu còn lai a