1. 80% + 2,5 x 2 1/2 2. 5,5 - 25% : 3 1/2 = 3. a : 1/3 = 1 Tentukan A!!!

1)  80/100  +  2,5  x  5/2  =  8/10  +  25/10  x  5/2

                                         =  8/10  +  125/20
                                    
                                         =  16/20  +  125/20

                                         =  141 / 20


2) 5,5  -  25/100  :  7/2       =    55/10  -  25/100  x  2/7  

                                           =   55/10  -  1/14                  

                                           =    770/140  -  10/140        

                                           =    760/140        
                           
                                           =   5 ⁶⁰/₁₄₀

                                           =   5 ³/₇

3)  a  :  1/3  =  1
 
     a  x  3    =   1

             a   =    1/3                             

1)...
80 % = 80 / 100
2,5 = 25 / 10
2 1/2 = 5 / 2
= 80 / 100 + (25 / 10 × 5 / 2)
= 80 / 100 + 25 / 4
= 16 / 20 + 125 / 20
= 141 / 20 ✔️

2)...
25 % = 25 / 100
5,5 = 55 / 10
3 1/2 = 7 / 2
= 55 / 10 - (1 / 4 × 2 / 7)
= 55 / 10 - 1 / 14
= 385 / 70 - 5 / 70
= 380 / 70
= 190 / 35
= 38 / 7 ✔️

3)...
a ÷ 1 / 3 = 1
a × 3 / 1 = 1
3a = 1
a = 1 / 3 ✔️

Semoga bermanfaat.....
-Prisco