5/7*4,2-(1 1/4 - 0,5)
6,5:(2 1/4 * 6-0,5)
(5-1 1/2):(2 3/8-1,75)
3 3/4*0,8+2 2/3*0,3
4 1/2 - 2,4:2 2/3+1,4
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a)5/7*4,2-(1 1/4-0,5)=5/7*21/5-(5/4-1/2)=1*3-(5/4-2/4)=3-3/4=2 1/4
b)6,5:(2 1/4*6-0,5)=13/2:(9/2*6/1-1/2)=13/2:(27/2-1/2)=13/2:26/2=13/2*2/26=1*1/2=1/2
c)(5-1 1/2):(2 3/8-1,75)=(5/1-3/2):(19/8-7/4)=(10/2-3/2):(19/2-14/8)=7/2:5/8+7/2*8/5=7/1*4/5=28/5=5 3/5
d) 3 3/4*0,8+2 2/3*0,3= 15/4*8/10+8/3*3/10=3/2*4/2+4/1*1/5=12/4+4/5=60/20=16/20=76/20=3 16/20
e)4 1/2 - 2,4:2 2/3+1,4=9/2-24/10:8/3+14/10=9/2-8/5:4/1+14/10=9/2-8/5*1/4+14/10=9/2-8/20+14/10=90/20-8/20+28/20=118/20-8/20=110/20=5 10/20=5 1/2