Question

Va rog, ajutati-ma ! Rezolvati urmatoarele ecuatii, unde x € Q:
a) 0,4÷x=1,(3)
b) 3,5÷x=0,3(8)
P.s. Le.am facut dar nu cred ca sunt corecte pt ca m-am uitat in carte si scrie altceva . Va rog eu mult , cat mai repede !

Answer 1

a) 0,4 : x = 1,(3) = 4/10 : x = (13-1) / 9

2/5 * 1/x = 12/9

2/5x = 4/3

5x = 6/4

5x = 3/2

x = 3/2 : 5

x = 3/2* 1/5

x = 3/10

b) 3,5 : x = 0,3(8)

35/10 : x = (38-3)/90

35/10 : x = 35/90

7/2 : x = 7/18

7/2 * 1/x = 7/18

7/2x = 7/18

x = (7*18)/(7*2) = 9