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3a=11/5 - 7/4
3a=9/20 /* 1/3
a=3/20
b)1,2/3-5c=1,1/4
-5c=5/4 - 5/3
-5c=-5/12 /*-1/5
c=1/12
c)1/2p:1,3/4=8
1/2p=8 * 7/4 /*2
p=28
5(3a+1,3)=4*2,1
15a+6,5=8,4
15a=1,9
1,2/3-5c=1,1/4 / *12
4*1,2-12*5c=3*1,1
4,8-60c=3,3
-60c=-1,5
c=0.025
1/2p:1,3/4=8
1/2p*4/1,3=8
p*2/1,3=8 / *1,3
2p=10,4
p=5,2
60a+35=44
60*0,150+35=44
a=0,150
b)1,2/3-5c=1,1/4/*12
12-60c=15
12-60*0.55=15
c=0.55
c)1/2p:8=8/*8
4p:8=8
4*16:8=8
p=16
:-) Mozesz jeszcze na kalkulatorze policzyc bo napewno dobrze