\(\dfrac{4^5\cdot9^4-2\cdot6^9}{2^{10}\cdot3^8+6^8\cdot20}=\dfrac{2^{10}\cdot3^8-2\cdot2^9\cdot3^8\cdot3}{2^{10}\cdot3^8+2^8\cdot3^8\cdot2^2\cdot5}=\dfrac{2^{10}\cdot3^8-2^{10}\cdot3^9}{2^{10}\cdot3^8+2^{10}\cdot3^8\cdot5}\)

\(=\dfrac{2^{10}\cdot3^8\left(1+3\right)}{2^{10}\cdot3^8\left(1+5\right)}=\dfrac{4}{6}=\dfrac{2}{3}\)

Có \(\frac{15.3^{11}+4.274}{9^7}=\frac{5.3.3^{11}+1096}{\left(3^2\right)^7}=\frac{5.3^{12}+1096}{3^{14}}=\frac{5.1+1096}{3^2}=\frac{5+1096}{9}=\frac{1101}{9}\)

1, (105 :5).35 = 21.35= 735

a)38.105:5.38=(38:38).(105:5)

                      =1.21

                      =21

a) 896 × 23 = 896 × (20 + 3)

= 896 × 20 + 896 × 3

= 17920 + 2688

= 20608

896 × 23 = 896 × (24 – 1 )

= 896 × 24 – 896 × 1

= 211504 – 896

= 20608

b) 547 × 38 = 547 × (30 + 8)

= 547 × 30 + 547 × 8

= 20786

547 × 38 = 547 × (39 – 1)

= 547 × 39 - 547 × 1

= 21333 – 547

= 20786

2.69+565.3

=138+1695

=1833 nha

k mk nha

mk k lại !

567,99

Bạn do thu ha làm sai rồi

=452.(17+98-15)

=452.100

=45200

=452 x(17+98-15)

=452 x 100

=45200

\(452\times17+452\times98-452\times15\)
\(\Rightarrow452\times\left(17+98-15\right)\)
\(\Rightarrow452\times100\)
\(\Rightarrow45200\)

Đáp án là D

=-452-(-67+75-452)

=-452+67-75+452

=(452-452)+67-75

=0+67-75

=67-75

=-8

=-452-(-67+75-452)

=-452+67-75+452

=(452-452)+67-75

=0+67-75

=67-75

=-8

=-452-(-67+75-452)

=- 452 + 67 -75 + 452

=(452 - 452) + 67 - 75

=0 + 67 - 75

=67 - 75 =-8

\(452-\left(67-75+452\right)\)

\(=452-67+75-452\)

\(=-67+75\)

\(=8\)

\(452-\left(67-75+452\right)\\ =452-67+75-452\\ =\left(452-452\right)-67+75\\ =-67+75\\ =8\)

- 452 - ( - 67 + 75 - 452 )

= - 452 + 67 - 75 + 452

= [(- 452 ) + 452 ] + ( 67 - 75 )

=     0 + ( - 8 )

 =        - 8

mk đoán là -8 đúng ko 

= -452 + 67 - 75 + 452
= 67 - 75

= -8
Phá ngoặc đổi dấu, okeii><