5/9+12/7(14/3+21/8):7/4=5/9+(4*2-9/2):7/4=5/9+(8-4 1/2):7/4=5/9+(7/2)*(4/7)=5/9+2=5/9+18/9=23/9=2 4/9.
2-22/7(22/11-20/11):8/21=2-22/7(2/11):8/21=2-4/7:8/21=2-3/2=4/2-3/2=1/2.
4) 53/12-3/2:(13/6+8/15)*9/5=53/12-3/2:(65/30+16/30)*9/5=53/12-3/2:(81/30)*9/5=53/12-(15/27)*9/5=53/12-3/3=53/12-12/12=41/12=3 i 5/12.
3) 7/3+41/10:(37/15-5/12)*5/6=7/3+41/10:(148/60-25/60)*5/6=7/3+41/10:(123/60)*5/6=7/3+6/3*5/6=7/3+5/3=12/3=4
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Answers & Comments
5/9+12/7(14/3+21/8):7/4=5/9+(4*2-9/2):7/4=5/9+(8-4 1/2):7/4=5/9+(7/2)*(4/7)=5/9+2=5/9+18/9=23/9=2 4/9.
2-22/7(22/11-20/11):8/21=2-22/7(2/11):8/21=2-4/7:8/21=2-3/2=4/2-3/2=1/2.
4) 53/12-3/2:(13/6+8/15)*9/5=53/12-3/2:(65/30+16/30)*9/5=53/12-3/2:(81/30)*9/5=53/12-(15/27)*9/5=53/12-3/3=53/12-12/12=41/12=3 i 5/12.
3) 7/3+41/10:(37/15-5/12)*5/6=7/3+41/10:(148/60-25/60)*5/6=7/3+41/10:(123/60)*5/6=7/3+6/3*5/6=7/3+5/3=12/3=4