Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Tính a) 5^5 x 6^5 /15^4 x 4^2 b) 81^2 x 27^3 / 9^8

Toán Lớp 7: Tính a) 5^5 x 6^5 /15^4 x 4^2 b) 81^2 x 27^3 / 9^8

Comments ( 2 )

  1. a) \frac{5^5 . 6^5}{15^4 . 4^2} = \frac{5^5 . 2^5 . 3^5}{3^4 . 5^4 . 2^4} = \frac{5.2.3}{1} = 30
    b) \frac{81^2 . 27^3}{9^8} = \frac{9^7 . 3^3}{9^8} = \frac{3^3}{3^2} = 3
     

  2. a) ( 5^5 . 6^5 )/( 15^4 . 4^2 )
    = ( ( 5 . 6 )^5 )/( 15^4 . ( 2^2 )^2 )
    = ( 30^5 )/( 15^4 . 2^4 )
    = ( 30^5 )/( ( 15 . 2 )^4 )
    = ( 30^5 )/( 30^4 ) = 30
    b) ( 81^2 . 27^3 )/9^8
    = ( ( 3^4 )^2 . ( 3^3 )^3 )/( ( 3^2 )^8
    = ( 3^8 . 3^9 )/( 3^16 )
    = ( 3^17 )/( 3^16  ) = 3

Leave a reply

222-9+11+12:2*14+14 = ? ( )