0,8+2/3=8/10+2/3=4/5+2/3=(12+10)/15=22/15=1,4(6)
3,05-7/40=305/100-7/40=(1220-70)/400=1150/400=115/40=23/8=2,875
0,48×1/8=48/100×1/8=6/100=0,06
1/3 -0,(3)×0,25=1/3 -3/9×1/4=1/3 -1/3×1/4=1/3(1-1/4)=1/3×3/4=1/4
0,1:(4+1/25)=0,1:101/25=1/10 ×25/101=25/1010=0,0(2475)
0,5-1/2×(3/4-0,25)=5/10-1/2×(3/4-25/100)=1/2-1/2×(3/4-1/4)=1/2-1/2×2/4= =1/2-1/2×1/2=1/2-1/4=1/4
0,75-0,75×(19/10-1,5)=75/100-75/100×(19/10-15/10)=3/4-3/4×4/10=
=3/4-3/4×2/5=3/4×(1-2/5)=3/4×3/5=9/20=0,45
