Question

Calcular as expressões em metros:

 

12/5 dam + 7/4 hm e

2,8 km+ 85 hm+ 15,2 dam

Answer 1

12/5 dam + 7/4 hm   e   2,8 km+ 85 hm+ 15,2 dam

12/5 dam + 7/4 hm    resovlver por parte  OK!!!!
transformar

 12                 12                     12x10             120  
---- dam =      ----  x 10  =       ---------    =      ------  = 24 m
  5                   5                          5                   5


7/4 hm    
    7                 7                         7x100            700
  -----    =       ------  x100  =        --------      =     ----- = 175 m
     4                 4                             4                  4

12/5 dam + 7/4 hm    = 24m + 175m =  199 m



outra forma de fazer

12/5 dam + 7/4 hm = 
12 :5 = 2,4 m x 10 = 24 m
  7 :4 = 1,75 m x 100 =  175 m
12/5 dam + 7/4 hm = 24 m + 175 m = 199 m

2,8 km+ 85 hm+ 15,2 dam

2,8 km = 2,8 x 1000 = 2.800 m
85 hm =   85 x   100 = 8.500 m
15,2 dam = 15,2 x 10 = 152 m

2,8 km+ 85 hm+ 15,2 dam = 2.800 m + 8.500m + 152 m = 11.452 m
   

 

Answer 2

$a) \frac{12}{5}~dam+ \frac{7}{4}~hm$

$1~dam=10~m~~~e~~~1~hm=100~m$

Então teremos:

$\frac{12*10}{5}+ \frac{7*100}{4}$

$24+175$

$\boxed{199~m}$


$b)2,8~km+85~hm+15,2~dam$

Temos que:

$km=1~000~m$

$hm=100~m$

$dam=10~m$

Multiplicando, temos:

$2~800+8~500+152$

$\boxed{11.~452~m}$


Espero ter ajudado e tenha bons estudos ;)