`a,` `23` `.` `25` `+` `75` `.` `23` `-` `1300` `b,` `36` `:` $3^{2}$ `-` `5` `.` $2^{2}$

2 bình luận về “`a,` `23` `.` `25` `+` `75` `.` `23` `-` `1300` `b,` `36` `:` $3^{2}$ `-` `5` `.` $2^{2}$”

1. Giải đáp:

   a) 23.25 + 75.23 – 1300

   = [23.(25+75)] – 1300

   = 23.100 – 1300

   = 2300 – 1300

   = 1000

   $\\$

   b) 36 : 3^2 – 5.2^2

   = 36 : 9 – 5.4

   = 4-20

   = -(20-4)

   = -16.

    

    

   Trả lời
2. a) 23.25+75.23-1300

   =575+75.23-1300

   =575+1725-1300

   =1000

   $\\$

   b) 36:3^2-5.2^2

   =36:9-5.2^2

   =4-5.2^2

   =4-5.4

   =4-20

   =-16

   Trả lời