\(x-28-29=43\)
\(x-28=43+29\)
\(x-28=72\)
\(x=72+28\)
\(x=100\)
cách 2 :\(x-28-29=43\)
\(x-57=43\)
\(x=43+57\)
\(x=100\)
x - 28 - 29 = 43
x - 28 = 43 + 29
x - 28 = 72
x = 72 + 28
x = 100
X-28 - 29 = 43
=> X-28 = 43 + 29
=> X- 28 = 72
=> X= 72+28
=> X= 100
x-28-29=43
x-29 =43+28
x-29 =71
x =71+29
x =100
x - 28 - 29 = 43
x = 43 + 29 + 28
x = 100