a) 234 + 876 x 345          b) ( 987 - 234 ) x 869         

 = 234 + 302220               = 753 x 869

= 302454                          = 654357

c) 585 : 5 + 679 x 876

= 117 + 594804

= 594921

a) 234 + 876 x 345          b) ( 987 - 234 ) x 869         

 = 234 + 302220               = 753 x 869

= 302454                          = 654357

c) 585 : 5 + 679 x 876

= 117 + 594804

= 594921

a, 234 + 876 x 345

=  234 + 302220

= 302454

b,( 987 – 234) x 869

=    753           x 869

=     654357

c , 585 : 5 + 679 x 876

=  117       + 594804

=  594921

`a)234+876xx345`

`=234+30220`

`=302454`

___________________

`b)(987-234)xx869` 
`=753xx869`

`=654357`

___________________

`c)585:5+679xx867`

`=117+588693`

`=588810`

`@An`

\(a,\dfrac{1}{2023}>0;-\dfrac{5}{2024}< 0\\ Nên:-\dfrac{5}{2024}< 0< \dfrac{1}{2023}\Rightarrow-\dfrac{5}{2024}< \dfrac{1}{2023}\\ b,\dfrac{678}{876}< 1;\dfrac{987}{789}>1\\ Nên:\dfrac{678}{876}< 1< \dfrac{987}{789}\Rightarrow\dfrac{678}{876}< \dfrac{987}{789}\)

\(c,\dfrac{535353}{585858}=\dfrac{535353:10101}{585858:10101}=\dfrac{53}{58}=1-\dfrac{5}{58}\\ \dfrac{301}{306}=1-\dfrac{5}{306}\\ Vì:\dfrac{5}{58}>\dfrac{5}{306}\Rightarrow1-\dfrac{5}{58}< 1-\dfrac{5}{306}\\ Nên:\dfrac{535353}{585858}< \dfrac{301}{306}\)

\(d,\dfrac{9}{71}=\dfrac{9.3}{71.3}=\dfrac{27}{213}\\ Vì:\dfrac{27}{213}< \dfrac{27}{211}\\ Nên:\dfrac{9}{71}< \dfrac{27}{211}\)

99x9=891

10x10x10x987x666=657342000

Mình đã k và kết bạn rồi

99 x 9 = 891

10 x 10 x 10 x 987 x 66 = 657342000

Ai tk và kết bạn với mk thì mk tk lại cho .

99 x 9

= 9 x 99

= 891

10 x 10 x 10 x 987 x 666

= 1000 x 987 x 666

= 987 000 x 666

= 657 342 000

987x 987x987x987x987 = 987⁵

=987⁵

Tinh nhanh nhe ! ^ . ^

876 x 64 – 876 x 54 = 876 x ( 64 – 54) = 876 x 10 = 8760

876 x 64 – 876 x 54

= 876 x ( 64 – 54 )

= 876 x 10

= 8760

= 8760

876 x 64 – 876 x 54

= 876 x ( 64 – 54 )

= 876 x 10

= 8760

8760

\(=876\times\left(64-54\right)=876\times10=8760\)

\(\text{8760}\)