Răspuns:
Explicație pas cu pas:
5.a. (x+2si8/15)x3/2=5si1/4
(x+38/15)x3/2=21/4
(x+38/15)=21/4÷3/2
(x+38/15)=21/4x2/3
x/38/5=7/2
x=7/2-38/15
x=(105-76)/30
x=29/30
b. 109/50÷y=109/1000
109/50x1/y=109/1000
109/50y=109/1000
50y=(109x1000)/109
50y=1000
y=1000/50
y=20