Question

Tìm x, biết:

a) ( 2017 - x ) : 3 = 345           d) x + 345 : 15 = 65

b) 317 - ( 213 - x ) = 137         e) 12.x + 24 = 744

c) [ ( 2x + 51 ) - 97 ] .3 = 72     g) 12 ( x + 24 ) = 744

Answer 1

a) ( 2017 - x ) : 3 = 345

<=> 2017 - x = 1035

<=> x = 2017 - 1035

<=> x = 982

b) 317 - ( 213 - x ) = 137

<=> 213 - x = 317 - 137

<=> 213 - x = 180

<=> x = 213 - 180

<=> x = 33

c) [ (2x + 51 ) - 97 ] . 3 = 72

<=> (2x + 51) - 97 = 24

<=> 2x + 51 = 121

<=> 2x = 70

<=> x = 35

d) x + 345 : 15 = 65

<=> x + 23 = 65

<=> x = 42

e) 12x + 24 =744

<=> 12x = 720

<=> x = 60

g) 12 (x + 24) = 744

<=> x + 24 = 62

<=> x = 38