x + 6 x 5 = 200 + 100

x + 6 x 5 = 300

x + 30 = 300

x = 300 - 30 

x = 270 

nhé !

x + 6 x 5 = 200 + 100

x +   30   =    300

x            =  300 - 30

x            =      270

x+600=600+400

  x=400

x=400 k mik nha

          ^~^

1000 + 1000 - 2000 + 1000

= 2000 - 2000 + 1000

= 0 + 1000

= 1000

1000+1000-2000+1000

=2000-2000+1000

=0+1000

=1000

1200 vs 10000 k tớ thảo ơi tớ k ấy roài

\(1099+1=1100\)

\(900+100=1000\)

ok lun bạn

123 + 123 + 123

= 246 + 123 

= 369

900 + 900 + 900

= 1800 + 900

= 2700

123+123+123=369

900+900+900=2700

\(9000+1000=10000\)

\(777+23=800\)

\(nha^{chuc}bn^{hoc}gioi!\)

\(nhe^{bn}\)

= 10000

=7800

8000 + 2000
= 10000

0 + 1 + x = 99
1 + x = 99 - 0
1 + x = 99
x = 99 - 1
x = 98

8000 + 2000
= 10000

0 + 1 + x = 99
1 + x = 99 - 0
1 + x = 99
x = 99 - 1
x = 98

8000+2000=10000

Cần số bao là:

48:(64:8)=6 (bao )

2 : A=(1+0.0) + (1+1.1) + (1+2.2) + (1+3.3) + (1+4.4) + (1+5.5) + (1+6.6) + (1+7.7) + (1+8.8) + (1+ 9.9) + (1+10.10) = Tự tính nhá 

A= 1+2+5+10+17+26+...+101 
A = 1+2+5+10+17+26+37+50+65+82+101 
A = 101 + ( 65 + 26 + 10 ) + ( 82 + 17 + 2 ) + ( 1 + 5 + 37 + 50 ) 
A = 101 + 101 + 101 + 93 
A = 101 x 3 + 93 
A = 303 + 93 
A= 396