A
3/5+1,1+(0,9-2/5)=
=3/5+11/10+(9/10-2/5)=
=6/10+11/10+(9/10-4/10)=
=17/10+5/10=
22/10=11/5=2 1/5
B
(3,6-1 1/4)x1,4+13 1/5:3 2/5=
=(36/10-5/4)*14/10+61/5:17/5=
= (18/5-5/4)*7/5+61/5*5/17=
=(72/20 -25/20)*7/5+61/17=
=( 47/20)*7/5+61/17=
= 329/100+61/17=
=5593/1700+6100/1700=
= 11693/1700=
= 6 1493/1700
C
4/5+(1,2x5/12+0,8):1/8=
=4/5+(12/10*5/12+8/10):1/8=
=4/5+(1/2+4/5)*8=
=4/5+(5/10+8/10)*8=
=4/5+13/10*8=
=4/5+ 104/10=
=4/5+ 52/5=
=56/5=11 1/5
D
(4,5x1 2/3-2,75):(1-10/27:5/6)=
=(45/10*5/3-2 3/4):(1-10/27*6/5)=
= (225/30-11/4):(1-60/135)=
=(900/120-330/120):(135/135-60/135)=
=570/120:75/135=
=57/12: 15/27=
=57/12*27/15=
= 1539/180=
= 8,55
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A
3/5+1,1+(0,9-2/5)=
=3/5+11/10+(9/10-2/5)=
=6/10+11/10+(9/10-4/10)=
=17/10+5/10=
22/10=11/5=2 1/5
B
(3,6-1 1/4)x1,4+13 1/5:3 2/5=
=(36/10-5/4)*14/10+61/5:17/5=
= (18/5-5/4)*7/5+61/5*5/17=
=(72/20 -25/20)*7/5+61/17=
=( 47/20)*7/5+61/17=
= 329/100+61/17=
=5593/1700+6100/1700=
= 11693/1700=
= 6 1493/1700
C
4/5+(1,2x5/12+0,8):1/8=
=4/5+(12/10*5/12+8/10):1/8=
=4/5+(1/2+4/5)*8=
=4/5+(5/10+8/10)*8=
=4/5+13/10*8=
=4/5+ 104/10=
=4/5+ 52/5=
=56/5=11 1/5
D
(4,5x1 2/3-2,75):(1-10/27:5/6)=
=(45/10*5/3-2 3/4):(1-10/27*6/5)=
= (225/30-11/4):(1-60/135)=
=(900/120-330/120):(135/135-60/135)=
=570/120:75/135=
=57/12: 15/27=
=57/12*27/15=
= 1539/180=
= 8,55