Question

(7/18-x) * (21/5 - 7/2) = 7/50
(7/30+11/45) : (1/2-x) = 1
(7/24-x):(3/8-1/10)=1
(5/28 - x):(5/42-3/28)=1

DAU COROANA!

Answer 1

Răsp

21/5-7/2=42-35/10=7/10

7/18-x=7/50:7/10

7/18-x=7/50*10/7

7/18-x=1/5

18-x=35 rezulta x = -17

7/30+11/45=21/90+22/90=43/90

43/90*(2-x)=1 rezulta 2-x = 1:43/90 adica x = 2-1*90/43=68-90/43=22/43

3/8-1/10=15/40-4/40=11/40

7/24-x=1*11/40 adica 11(24-x)=40*7 rezulta 24-x = 280/11 rezulta x = 24-280/11 = 264-280/11=-16/11

5/42-3/28 = 10/84-9/84=1/84

5/28-x=1*1/84 rezulta 28-x=5*84 rezulta x = -420+28=392

Explicație pas cu pas: