`15+20-30=5`
`5+8-9=4`
`45-8+12=49`
`49-49=0`
`=> 5+4+49=58`.
15+20-30=5
3+8-9=2
45-8+12=49
53-49=4
5+2+49+4=60
Chúc bạn học tốt.
15+20-30=5
3+8-9=2
45-8+12=49
53-49=4
5+2+49+4=60
bài làm
15+20−30=515+20-30=5
5+8−9=45+8-9=4
45−8+12=4945-8+12=49
49−49=049-49=0
⇒5+4+49=58⇒5+4+49=58.ok
15 + 20 - 30 = 5
5 + 8 - 9 = 4
45 - 8 + 12 = 49
49 - 49 = 0
=>5 + 4 + 49 = 58
15+20−30=5
5+8−9=4
45−8+12=49
49−49=0
⇒5+4+49=58.
15+20−30=515+20-30=5
5+8−9=45+8-9=4
45−8+12=4945-8+12=49
49−49=049-49=0
⇒5+4+49=58⇒5+4+49=58.
15 + 20 − 30 = 5
5 + 8 − 9 = 4
45 − 8 + 12 = 49
49 − 49 = 0
⇒ 5 + 4 + 49 = 58 .
\(\text{15 + 20 − 30 = 5}\)
\(\text{5 + 8 − 9 = 4}\)
\(\text{45 − 8 + 12 = 49}\)
\(\text{49 − 49 = 0}\)
-5+4+49=58
