Răspuns :
9/25+1/10=18/50+5/50=23/50
12,38-(-4,5)=12,38+4,5=16,88
-6/7:10/21=-6/7 ×21/10=-9/5
(2/3)⁵ : (2/3)³=(2/3)²=4/9
-7/4 × 20/49 =-5/7
1,(12)=(112-1)/99=111/99=37/33
12,38-(-4,5)=12,38+4,5=16,88
-6/7:10/21=-6/7 ×21/10=-9/5
(2/3)⁵ : (2/3)³=(2/3)²=4/9
-7/4 × 20/49 =-5/7
1,(12)=(112-1)/99=111/99=37/33