Folosind proprietatile adunarii si inmultirii, efectuati: a) 0,45x -1/45, b) 1/9 x -4/7 + 4/7 x 1/9;
c) 3/5 x (5/3 + 5); e)(4 intregi si 1/3-37,12-13/3); f) ( 1/37- 4/112+ 36/117) x ( 4/3 -1,(3);g) 0,4 x 5,16+ 0,4 x 4,84; h) 1998 x 37 +1998 x 64- 1998, i) 4/7-(-1) la n + 5/7(-1) la n+1 + 1/7(-1) la n+2.
Va rog e urgent !!!

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