{x + 120 } ; 20 = 8 x . 5 – x . 2 = 120 x . 13 – x . 10 = 240 bài 12 , 13 sgklớp /107 giú mik với
{x + 120 } ; 20 = 8 x . 5 – x . 2 = 120 x . 13 – x . 10 = 240 bài 12 , 13 sgklớp /107
By Claire
By Claire
{x + 120 } ; 20 = 8 x . 5 – x . 2 = 120 x . 13 – x . 10 = 240 bài 12 , 13 sgklớp /107 giú mik với
a,( x+120 ) :20=8
( x +20) =8. 20
x+20 =160
x =160-20
x = 140
b,x.5-x.2=120
x.(5-2)=120
x .3 =120
x =120:3
x =40
c,x.13-x.10=240
x.(13-10)=240
x.3 =240
x =240:3
x =80
( x + 120 ) : 20 = 8
x + 120 = 8 * 20
x + 120 = 160
x = 160 – 120
x = 40
x . 5 – x . 2 = 120
x . ( 5 – 2 ) = 120
x . 3 = 120
x =120 : 3
x = 40
x . 13 – x . 10 = 240
x . ( 13 – 10 ) = 240
x . 3 = 240
x = 240 : 3
x = 80