\(99\times36+57\times99+99-84\times99\)

\(=99\times(36+57+1-84)\)

\(=99\times10=990\)

99 x 36 + 57 x 99 - 84 x 99

= 99 x ( 36 + 57 + 1 - 84 )

= 99 x 10

= 990

99 x 36 + 57 x 99 + 99 - 84 x 99

= 99 x ( 36 + 57 + 99 - 84 )

= 99 x 108

= 10.692

1268 + 99 + 501= 1268 + ( 99 + 501)

…= 1268 + 600 = 1868

7,48 + 7,48 ⨯ 99 = 7,48 ⨯ (1 + 99) = 7,48 ⨯ 100 = 748

3640

3640

3640

72/22 - 28/22 - 14/22

= 2 - 14/22

= 15/11

\(\frac{77}{22}-\frac{28}{22}-\frac{14}{22}\)

\(=\frac{77-28-14}{22}\)

\(=\frac{35}{22}\)

72/22 - 28/22 - 14/22

= 2 - 14/22

=15/11

( 99 + 1 ) x 2341
= 100 x 2341
= 234100

HT + :)))

99 x 15 + 15 = 15 x ( 99 + 1) = 15 x 100 = 1500

7,48 x ( 99 + 1 )

= 7,48 x 100

= 748

7,48 x ( 99 + 1 )

= 7,48 x 100

= 748

748

7,48 + 7,48 x 99

= 7,48 x 1 + 7,47 x 99

= 7,48 x (1 + 99)

= 7,48 x   100

=       748

la 7,48*(99+1)=7,48*100=748

7.48 và 7.48 bằng 1 

nên 1*99=99