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urgent!¡!!!!!!!!!dau coroana....

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Răspuns :

Vfarsch
a) Δ100×(64+1689)
100×1753
175300
Δ100×64+100×1689
6400+168900
175300
b) Δ 8×(41+5+203)
8×249
1992
   Δ 8×41+8×5+203×8
328+40+1624
368+1624
1992
c) Δ12×(45-9+120)
12×(36+120)
12×156
1872
    Δ12×45-9×12+120×12
540-108+1440
432+1440
1872