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![](https://rs.olm.vn/images/avt/0.png?1311)
12+x=43
x=43-12
x=31
x+33=55
x=55-33
x=22
44+x=63
x=63-44
x=19
k mik nha đúng100%
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 11 = 22
22 + 22 = 44
33 + 33 = 66
44 + 44 = 88
55 + 55 = 110
Học tốt~
![](https://rs.olm.vn/images/avt/0.png?1311)
11+22=33
22+33=55
33+44=77
44+55=99
55+66=121
66+77=143
77+88=165
88+99=187
99+100=199
11+22=33
22+33=55
33+44=77
44+55=99
55+66=121
66+77=143
77+88=165
88+99=187
99+100=199
chúc bn hok tốt
tk+kb vs mk nha m.n!
c.ơn m.n nhìu!
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\(x-28=22\)
\(x=22+28\)
\(x=50\)
b)
\(x-55=16\)
\(x=16+55\)
\(x=71\)
c)
\(x-26=46\)
\(x=46+26\)
\(x=72\)
d)
\(x-33=18\)
\(x=18+33\)
\(x=51\)
e)
\(x-38=44\)
\(x=44+38\)
\(x=82\)
g)
\(x-5=57\)
\(x=57+5\)
\(x=62\)
a) = 50
b) = 71
c) = 72
d) = 51
e) = 82
g) = 62
k cho mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
11+22+33+44+55+66+77+88+99
= ( 11 + 88 ) + ( 22 + 77 ) + ( 33 + 66 ) + ( 44 + 55 ) + 99
= 99 + 99 + 99 + 99 + 99
= 99 x 5
= 495
10+20+30+40+50
= ( 10 + 40 ) + ( 20 + 30 ) + 50
= 50 + 50 + 50
= 50 x 3
= 150
K mình nha mình nhanh nhất đó!
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 21 + 12 - 3 + 44 + 55) x ( 2 x 6 -4x3) = (21+12-3+44+55)x( 12-12)
=(21+12-3+44+55)x0 = 0
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 33 = 44 + 55
x + 33 = 99
x = 99 - 33
x = 66
Vậy x = 66.
x + 33 = 44 + 55
x + 33 = 99
x = 99 : 33
x = 3
hok tốt !