X x 99 + X = 300
\(\Rightarrow\)X x 100 = 300
\(\Rightarrow\)X = 3
X x 123 - 245 = 7012
\(\Rightarrow\)X x 123 = 7257
\(\Rightarrow\)X = 7257 : 123
\(\Rightarrow\)X = 59
X x 124 - 2568 = 5988
\(\Rightarrow\)X x 124 = 8556
\(\Rightarrow\)X = 8556 : 124
\(\Rightarrow\)X = 69
X x 99 + X = 300
X x ( 99 + 1 ) = 300
X x 100 = 300
X = 300 : 100
X = 3
X x 123 - 245 = 7012
X x 123 = 7012 + 245
X x 123 = 7257
X = 7257 : 123
X = 59
X x 124 - 2568 = 5988
X x 124 = 5988 + 2568
X x 124 = 8556
X = 8556 : 124
X = 69
X x 99 + X =300
Xx(99+1)=300
X x 100 = 300
X =3
X x 123 - 245 =7012
X x 123 =7257
X =59
X x 124 - 2568 = 5988
X x 124 =8556
X x =8556 :124
X =69
X x 99 + X = 300
=> X x (99 + 1) = 300
=> X x 100 = 300
=> X = 3
X x 123 - 245 = 7012
=> X x 123 = 7257
=> X = 7257 : 123
=> X = 59
X x 124 - 2568 = 5988
=> X x 124 = 8556
=> X = 8556 : 124
=> X = 69
X × 99 + X = 300
X × ( 99 + 1 ) = 300
X × 100 = 300
X = 300 : 100
X = 3
Vậy X = 3
X × 123 - 245 = 7012
X × 123 = 7012 + 245
X × 123 = 7257
X = 7257 : 123
X = 59
Vậy X = 59
X × 124 - 2568 = 5988
X × 124 = 5988 + 2568
X × 124 = 8556
X = 8556 : 124
X = 69
Vậy X = 69
X x 99 + x = 300 X x 123 - 245 = 7012 X x 124 - 2568 = 5988
X x ( 99 + 1 ) = 300 X x 123 = 7012 + 245 X x 124 = 5988 + 2568
X x 100 = 300 X x 123 = 7257 X x 124 = 8556
X = 300 : 100 X = 7257 : 123 X = 8556 : 124
X = 3 X = 59 X = 69
X x 99 + X = 300
X x 99 + X x1=300
X x(99+1)=300
X x 100=300
X =300:100
X =3
X x 123 - 245 = 7012
X x 123 =7012+245
X x 123 =7257
X =7257:123
X =59
X x 124 - 2568=5988
X x 124 = 5988+2568
X x 124 =8556
X = 8556 : 124
X =69
