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Sagot :

DILOUFATHE

1: p=m/v

m=p ×v

200ml=0,2l

m= 0,9 ×0,2

m=0,18kg

v=m/p

300g=0,3kg

v=0,3/0,9

v=0,33l

2: m= p × v

0,35dm3= 0,0035m3

m= 7,9×0,0035

m=0,03g

v= m/p

v=300/7,9

v=37,97cm3

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