64 x 867 + 867 x 36 - 30 x 867

= 867 x ( 64 + 36 - 30 )

= 867 x 70

= 60 690

\(64\times867+867\times36-30\times867\)

\(=867\times\left(64+24-30\right)\)

\(=867\times70\)

\(=60690\)

64 x 867 + 867 x 36 - 30 x 867 

= 867 (64 + 36 - 30)

= 867 * 70 

= 60690

=867 x ( 64 + 36 - 30)

=867x 70

=60690

876 549

Đáp án D

\(1+2+3+\cdots+10+\left(453+867\right)\)

=\(10\times\frac{11}{2}\) +1320

=55+1320

=1375

C          =        \(\dfrac{3}{2}\) + \(\dfrac{3}{4}\) + \(\dfrac{3}{8}\)+ \(\dfrac{3}{16}\)+...........+\(\dfrac{3}{128}\)

C\(\times\)2      =  3 + \(\dfrac{3}{2}\) + \(\dfrac{3}{4}\) + \(\dfrac{3}{8}\) + \(\dfrac{3}{16}\)+...+\(\dfrac{1}{64}\)

C\(\times\)2 - C =  3 - \(\dfrac{3}{128}\)

C           = \(\dfrac{381}{128}\)

Câu E em xem lại đề nhé 

a: \(\left(-2\right)^5+\left\lbrack\left(-7\right)^3:49+23\right\rbrack:\left(-2\right)\)

\(=-32+\left(-343:49+23\right):\left(-2\right)\)

\(=-32+\left(-7+23\right):\left(-2\right)=-32+16:\left(-2\right)\)

=-32-8

=-40

b: \(128\left(278-302\right)+278\left(302-128\right)\)

\(=128\cdot278-128\cdot302+278\cdot302-278\cdot128\)

\(=278\cdot302-128\cdot302=302\cdot150=45300\)

a) 25 + 69 + 75 + 11

= (25 + 75) + (69 + 11)

= 100 + 80

= 180

b) 64 x 867 + 36 x 867

= (64 + 36) x 867 

= 100 x 867

= 86700

c) 25 x 989 x 4 + 25

= 25 x 4 x 989 + 25

= 100 x 989 + 25

= 98900 + 25

= 98925

a)25 + 69 + 75 + 11 

=(25 + 75) + (69 + 11)

=100 + 80

=180

b)64 * 867 + 36 * 867

=(64 + 36) * 867

=100 * 867

=86700

c)25 * 989 * 4 +25

=25*3956+25

=25*(3956+1)

=25*3957

=98925

chào bn

Help

86,718 > 86,7xx

>> xx = 11

Vì 86,718 > 86,711

Vì đề bài có đôi phần vô lý nên mik đã sửa ạ.