Question

Tìm x biết

a) (x+74)-318=2015

b) 3636:(12 x X-91)=36

c) (x :23+45)x67=8911

Answer 1

a) ( x + 74 ) - 318 = 2015

=>  x + 74 = 2015 + 318

=> x + 74 = 2333

=> x = 2333 - 74

=> x = 2259

b) 3636 : ( 12 . x - 91 ) = 36

=> 12 . x - 91 = 3636 : 36

=> 12 . x - 91 = 101

=> 12 . x = 101 + 91

=> 12 . x = 192

=> x = 192 : 12

=> x = 16

c) ( x : 23 + 45 ) . 67 = 8911

=> x : 23 + 45 = 8911 : 67

=> x : 23 + 45 = 133

=> x : 23 = 133 - 45

=> x : 23 = 88

=> x = 88 . 23

=> x = 2024

Answer 2

Tìm x, biết :

a) ( x + 74) - 318 = 2015

(x + 74) = 2015 + 318

(x + 74) = 2333

x = 2333 - 742

x = 2259

b) 3636 : (12 . x - 91) = 36

12 . x - 91 = 3636 : 36

12. x - 91 = 101

12 . x = 101 + 91

12 . x = 192

x = 192 : 12

x = 16

c) ( x : 23 + 45) . 67 = 8911

(x : 23 + 45) = 8911 : 67

(x : 23 + 45) = 133

x : 23 = 133 - 45

x : 23 = 88

x = 88 . 23

x = 2024

. là nhân nha