Question

Tìm x:

a. 12x + 19x - 123 = 280

b) 5 - (17 - 3) = x - (2 - 15)

Answer 1

a.12x+19x-123=280

12x+19x =280+123

12x+19x =403

31x =403

x=403:31

x=13

b. 5-(17-3)=x-(2-15)

5-14 =x-(-13)

-9 =x+13

=> x=(-9)-13=-22

Answer 2

Tìm x:

a. 12x + 19x - 123 = 280

(12 + 19).x - 123 = 280

31.x - 123 = 280

31.x = 280 + 123

31.x = 403

x = 403 : 31

x = 13

 

Answer 3

b) 5 - (17 - 3) = x - (2 - 15)

5 - 14 = x - (-13)

(- 9) = x + 13

=> x = (-9) - 13 = -22

Answer 4

a)12x + 19x - 123= 280 12x +19x = 280 +123 12x + 19x = 403 31x=403 x =403:31 x=13