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calculati :a)2 supra 7× 21 supra 6
b)15 supra 45÷ 60 supra90​


Răspuns :

[tex]a) \frac{2}{7}*21=2*3=6\\b) \frac{15}{45}:\frac{45}{60}=\frac{15}{45}*\frac{60}{90}=\frac{1}{3}*\frac{2}{3}=\frac{2}{9}[/tex]