( 5 - 1 i 1/2 ) : ( 2 i 3/8 - 1,75 )
3 i 3/4 * 0,8 + 2 i 2/3 * 0,3
5/7 * 4,2 - ( 1 i 1/4 - 0,5 )
4 i 1/2 - 2,4 : 1 i 2/3 + 1,4
/ = kreska ułamkowa
* = znak mnożenia
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( 5 - 1 i 1/2 ) : ( 2 i 3/8 - 1,75 )=5-1,5):(2,375-1,75)=3,5:0,625=5,6
3 i 3/4 * 0,8 + 2 i 2/3 * 0,3=15/4*4/5+8/3*3/10=3+4/5=3 4/5=3,8
5/7 * 4,2 - ( 1 i 1/4 - 0,5 )=5/7*21/5-0,75=1/3-3/4=4/12-9/12=-5/12
4 i 1/2 - 2,4 : 1 i 2/3 + 1,4=4 1/2-12/5*3/5=4 1/2-4,25=4,5-0,16=4,34