15х = 0,15X=0,15/15
x=0,01
1)0,6а*0,2b=0,12ab
0,6×0,2=0,12 a×b=ab
2)4/5m*5/16n=1/4mn=0,25mn
4/5*5/16=1/4 m*n=mn
25 және 6 ЕүОБ (25, 6)=1; 25=5×5; 6=2×3
5 жəне 6 ЕҮОБ (6, 5)=1; 5=1×5
3 және 5 ЕҮОБ (3, 5)=1; 3=1×3
25 және 3 ЕҮОБ (25, 3)=1
Х-2 3/5=1 5/8
х=1 5/8+2 3/5
х=13/8+13/5
х=13*(5+8)/40
х=169/40=4 9/40
3/4ц,7/10ц,9/20ц,1/20т,3/5т,5/8т.