1C

2D

3D

4D

5B

6A

960 : x - 126 : x = 6

(960 - 126) : x   = 6

834 : x               = 6

x                        = 834 : 6

x                        = 139

(x²+1).(x-1)=0

=> có 2 TH : (x²+1) = 0 hoặc (x-1) = 0

TH1 : x²+1 = 0

          x²      = 0 - 1

          x²      = -1

=> Không tìm được x hợp lí

=> TH 1 (loại) 

TH2 : x-1=0

          x   = 0+1

          x   = 1

Vậy x  = 1

25.x + 10.y - 6.x + 9.y 

=(25-6)x + (10+9). y

=  19x + 19y

= 19(x+y)

ĐỀ BÀI LÀ SAO BẠN ?

54-7=47

33,75 

In the future, I think my life is very wonderful. I will be math teacher in my secondary schools, simply because I love it's. I will live with my family in a mordern flat in the city. Around my house, will has very very flower, tree and herbal plant. I will go to work by fly car. I will teachs my student by touchpad, they learn by laptop or tablet. Just imagining it feels great

In the future, I think my life is very wonderful. I will be math teacher in my secondary schools nows, simply because I love it's. I will live with my family in a mordern flat in the city. Around my house, will has very very flower, tree and herbal plant. I will go to work by fly car. I will teachs my student by touchpad, they learn by laptop or tablet. Just imagining it feels great

In the future, I think my life is very wonderful. I will be math teacher in my secondary schools nows, simply because I love it's. I will live with my family in a mordern flat in the city. Around my house, will has very very flower, tree and herbal plant. I will go to work by fly car. I will teachs my student by touchpad, they learn by laptop or t

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