x+7+4=21
x+7 = 21-4
x+7 = 17
x = 17-7
x =10
k mik nha
x+7+4=21
x+7=21-4
x+7=17
x=17-7
x=10
k cho mk nha
\(x+7+4=21\)
\(=>x+11=21\)
\(\Rightarrow x=21-11\)
\(\Rightarrow x=10\)
\(x+7+4=21\)
\(x+7=21-4\)
\(x+7=17\)
\(x=17-7\)
\(x=10\)
x + 7 + 4 = 21
x + 11 = 21
x = 21 -11
x = 10
x + 7 + 4 = 21
x + 7 = 21 - 4
x + 7 = 17
x = 17 - 7
x = 10
x + 7 + 4 = 21
x + 11 = 21
x = 21 - 11
x = 10
Tìm x biết : x+7+4=21
(x+7)+4=21-4
x+7 =17
x =17-7
x =10
x+7+4=21
x+11=21
x=21-11
x=10
Dễ ợt!!!!!!!!!!!
x+7+4=21
x+11=21
x=21-11
x=10
x+7+4=21
x+11=21
x=21-11
x=10