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y-siarka
x+y=80
x/y=1/4
x+y=80 x+4x=80
y=4x 5x=80 /:5
x=16
x=16
y=4x y=4*16
y=64
x=16
y=64
odp.16g miedzi i 64g siarki
80g Cu2S--------5(1+4)
xg Cu-----------1
x=80/5
x=16g Cu
80g Cu2S--------5(1+4)
xg S-----------4
x=80*4/5
x=64g S
Do reakcji użyto 16g Cu i 64g S