\(9000+1000=10000\)

\(777+23=800\)

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

\(nhe^{bn}\)

= 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

90+10+100=200

dễ ợt

90 + 10 + 100

= 100 + 100

= 200

a + 1 = 10

a = 10 - 1

a = 9

     \(700+300x2\)

\(=700+600\)

\(=1300\)

        \(900+100x5\)

\(=900+500\)

\(=1400\)

K mk mk k lịa nhé

=1300

=1400 k nha

=195 k nha

195 kkkkkkkkkkkkkkkkkk!

90 + x = 100

        x = 100 - 90

        x = 10

x - 10 = 90

      x = 90 + 10

     x = 100

x - 90 = 10

      x = 10 + 90

      x = 100

k 

90 + x = 100

x = 100 - 90

x = 10

x - 10 = 90

x = 90 + 10

x = 100

x - 90 = 10

x = 10 + 90

x = 100

95 + 5 + 100 = 200

100 + 100 = 200

5 + 95 = 100

95 + 5 + 100

= 100 + 100

= 100 x 2

= 200

100 + 100

= 100 x 2

= 200

5 + 95 

= 100

12345 + 0

= 12345

9090 + 10

= 9100

nha ~~~

12345 + 0 = ?

ta có

12345 + 0 = 12345

9090 + 10 = ?

ta có

9090 + 10 = 9100