1) ( - 1) x ( - 2) x ( - 3) = + 2 x ( - 3 ) = - 6
2) 12 = 2² x 3
18 =2 x 3²
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c.m.m.d.c. = 2² x 3²
= 4 x 9
= 36
3) ( 0,1,2,3) ∩ ( 1,3,5) = ( 1,3) , numere comune
4) P patrat = 16 cm
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A patrat =
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a) P patrat = 4l
4l = 16 ⇒ l = 16 : 4 ⇒
l = 4 cm , l = latura patrat
b) A patrat = l²
A patrat = 4²
A patrat = 16 cm²