Question

Câu 1: Tìm x

a, X + 12 = 12 + 6          14 – X = 14 – 2

b, X – 21 = 33 - 21           65 – X = 48 + 17

Câu 2: Tìm x

a, X + 25 = 100 - 25          700 – X = 300 + 200

b, X + 125 = 100 + 125       X – 48 = 65 – 28

Câu 3: Tìm y

a, 45 + y = 67 +17           27 + y = 44 + 18

b, y x 4 = 8 x 2             2 x y = 2 x 9

c, 5 x y = 30 : 3             y x 3 = 24 + 6

Câu 4: Tìm y

a, 123 – y = 456 - 345           y + 345 = 657 + 170

b, y – 112 + 12 = 574            y – 231 = 405 + 15

Câu 5 : Tìm x

a, 170 – X = 46 + 48               65 + 59 + X = 179

b, X – 21 = 33 -21                 65 – X = 48 + 17

Answer 1

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

Answer 2

Tìm xToán lớp 2 

Answer 3

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

Answer 4

kinh quá các anh ạ 

Answer 5

a) x+12=12+6 x+12=18 x. = 18-12 x. = 6