a)  5 6 : 0 , 125 − 2 1 4 − 0 , 6 . 10 11 = 5 6 : 1 8 − 9 4 − 3 5 . 10 11 = 155 11

b)  1 , 4. 15 19 − 4 5 + 2 3 : 2 1 5 = 7 5 . 15 19 − 22 15 : 11 5 = 21 19 − 2 3 = 25 57

a, > 

b,>

c, <

a)>

b)>

c)<

1. Dien<;>;=

a) 13:x.     >.          12:x

b) 215:3.  >.           215-215+215-215

c) m:n.      <            m+n(n khac 0 va m lon hon hoac bang n)

a. 13 × x > 12 × x (x khác 0)

b. 215 × 3 < 215 + 215 + 215 + 215

c. m × n > m – n (n khác 0, m lớn hơn hoặc bằng n)

Chọn B

B

B

\(215\times94+215\times5+215\)
\(=215\times\left(94+5+1\right)\)
\(=215\times100\)
\(=21500\)

215 × 94 + 215 × 5 + 215

= 215 × ( 94 + 5 + 1 )

= 215 × 100

= 21500

Bạn ghi lại đề đi bạn

= 215 x 85 + 215 x 1 + 215 x 14

= 215 x ( 85 + 14 +1 ) 

= 215 x 100

= 21500

Đáp án:

215 x 85 + 215 + 215 x 14

=215 x (85 + 14 +1)

=215 x 100

=21500

 215 x 85 +215 +215 x14

=215 x 85 +215 x 1 +215 x14

=215 x (85 + 1+14)

=215 x     100

=   21500

\(215\times868+215\times14=215\times\left(865+14\right)=215\times879=\text{188985 }\)

   215\(\times\)869+215\(\times\)14

=215\(\times\)(869+14)

=215\(\times\)    883

=189845

a)

Ta có 215 x 86 +13 x 215 +215

=215x(86+13+1)

=215 x 100

=215

b)

Ta có 52 x 128 - 41 x 128 - 128 -128

=128 x ( 52 -41 -1-1)

=128 x  9

=1152

a)   215*86 + 13*215 + 215 = 215*( 86 + 13 + 1 ) = 215*100 = 21500

b)   53*128 - 41*128 - 128 - 128 = ( 53 - 41 - 1 - 1 )*128 = 10*128 = 1280

a) 215*86+13*215+215

=215*(86+13+1)

=215*100

=21500

b) 53*128-41*128-128-128

=128*(53-41-1-1)

=128*10

=1280