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a fost răspuns

Calculati
a)18×19+20×21-22×23+2×[15+3×(40^2-39^2)]
b)2013×2012+2013×2011-2013×2022+7×[9+2×(53^2-52^2)] ^inseamna la putere
Va rog este urgent!!

Răspuns :

Bya2000
a) 342+420-506+2x[15+3x(1600-1521)]= 256+2x(15+3x79)= 256+2x(15+237)= 256+30+474= 760 b) 2013x(2012+2011-2022)+7x[9+2x(2809-2809)]= 2013x2001+7x9= 2013x2001+63= 4028076
Geea
a)342+420-506+2*[15+3*(1600-1521)]
   =342+420-506+2*(15+3*79)
   =342+420-506+2*(15+237)
   =342+420-506+2*252
   =342+420-506+504
   =762-1010
   =-248

b)4050156+4048143-4070286+7*[9+2*(2809-2704)]
=4050156+4048143-4070286+7*(9+2*105)
=4050156+4048143-4070286+7*(9+525)
=4050156+4048143-4070286+7*534
=4050156+4048143-4070286+3738
=8098299-4074024
=4024275
Sper cate-am ajutat

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