81 : 3^2 + 5 x 3

= 81 : 9 + 5 x 3

= 9 + 5 x 3

= 9 + 15

= 24

81 : 3^2 + 5 x 3 = 3^4 : 3^2 + 5 x 3

                        = 3^2 + 15 = 9 + 15 = 24

= [ 60/90 - ( 12/15 + 10/15) ] : 6/5

= ( 2/3 - 22/15 ) x 5/6

= ( 10/15 - 22/15 ) x 5/6

= -12/15 x 5/6

= -60/90

= -2/3

( 15/10 x 4/9 - ( 4/5 + 2/3 )) : 6/5

( 15/10 x 4/9 - ( 12/15 + 10/15 )) : 6/5

(30/45 - 66/45 ) : 6/5

-12/15 : 6/5 ( đã rút gọn -36/45 = -12/15 )

-2/3

k mk na <3

-1/2+ 2/3 - 3/4 + 4/5

trả lời:

-1/2+ 2/3 - 3/4 + 4/5

=13/60

a,4x5²-81: 3²

^=4.25-81:9

^=100-9

=91

b,3³x22-3³x19

=27.22-27.19

=27.(22-19)

=22.3

=66

dấu(.) thay cho dấu(x)

\(a,4\cdot5^2-81:3^2=4\cdot25-81:9=100-9=91\)

\(b,3^3\cdot22-3^3\cdot19=3^3\left(22-19\right)=3^3\cdot3=3^4\)

\(\dfrac{16^3.3^{10}+120.6^9}{4^6.3^{12}+6^{11}}=\dfrac{\left(2^4\right)^3.3^{10}+3.5.2^3.\left(2.3\right)^9}{\left(2^2\right)^6.3^{12}+\left(2.3\right)^{11}}\)

\(=\dfrac{2^{12}.3^{10}+3.5.2^3.2^9.3^9}{2^{12}.3^{12}+2^{11}.3^{11}}=\dfrac{2^{12}.3^{10}+5.2^{12}.3^{10}}{2^{12}.3^{12}+2^{11}.3^{11}}\)

\(=\dfrac{2^{12}.3^{10}\left(1+5\right)}{2^{11}.3^{11}.\left(2.3+1\right)}\)\(=\dfrac{2^{12}.3^{10}.6}{2^{11}.3^{11}.7}=\dfrac{2.2}{7}=\dfrac{4}{7}\)

= 280 :  [25 + ( 30 - 3 mũ 3 ) ]

= 280 :  [ 25 + ( 30 - 27 ) ]

=  280 : ( 25 + 3 )

= 280 : 28

=10  

= 35 . 67 - 167 . 35
= 35 . (67 - 167 )
= 35 . ( -100 )
= -3500

35.67+167.(-35)

=35.67+(-167).35

=35.[67+(-167)]

=35.100=3500

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