x + 50 = 60

x = 60 - 50

x = 10 

x+50=60

x     = 60-50

x     = 10

Ai tk mik, mik tk lại, ai ko tk thì thui nhé

= 20 125 000 !!!

La 20125000

40+5=45

80-80=0

70-40=30

30+30=60

70+30=100

 40 + 5 = 45 

80 - 80 =0

70 - 40 =30

30 + 30 =60

70 + 30 =100

Ai tk mk mk tk lại 

40+60=100

40 + 60 = 100

k minh nha 

10+10+10+10.10.10

=10+10+10+10.100

=40.100

=4000

10 + 10 + 10 + 10 . 10 . 10

= 30 + 1000

= 1030

20 x 40 + 20x 60

= 800 + 1200

= 2000

k mik nha

20 x 40 + 20 x 60

= 20 x ( 40 + 60 )

= 20 x 100

= 2000

tk mk nhé

0 + 200 x 0 = 0

60 + 40 x 0 = 0

90 + 112233443 x 0 = 0

0 + 0 + 0 + 1234 =  1234

Ai  nhanh và tk cho mk thì mk tk lại nhé

\(0+200.0=0+0=0\) 

\(60+40.0=60+0=60\) 

\(90+112233443.0=90+0=90\) 

\(0+0+0+1234=1234\)

=7 x 2 x 8 + 7 x 9 + 7 x 75 

=7 x 16     + 7 x 9 + 7 x 75

=7 x (16 + 9 + 75)

=7 x 100

=700

tk đi 

mik tk lại ok:):):)

7.2.8+7.9+7.75

=7.16+7.9+7.75

=7.(16+9+75)

=7.100

=700

10 + 20 + 20 + 20 + 20 + 20 + 90 + 80 + 70 + 60 + 50 + 40 + 20 + 10

= 10 + (20 x 6) + (90 + 10) + (80 + 20) + 70 + (60 + 40)

= 10 + 120  + 100 + 100 + 70 + 100

= 530

10 + 20 + 20 + 20 + 20 + 20 + 90 + 80 + 70 + 60  + 50 + 40 + 20 + 10

= 10 + (20 x 5) + (90 + 10) + (80 + 20) + 70 + (60 + 40) + 50

= 10 + 100 + 100 + 100 + 70 + 100 + 50

= 530