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:
