Question

calculati in doua moduri:
a)4999*1995+1994*4999-3988*4999
b)2011*3211-3211+2010*1789
c)129*130+220*129-350*99
d)3022*102-3022+101*1978-5000*99

Answer 1

a) =4999(1995+1994-3988)=4999·1=4999

b) =3211(2011-1)+2010·1789=3211·2010+2010·1789=2010(3211+1789)=
2010·5000=10.050.000

c) =129(130+220)-350·99=129·350-350·99=350(129-99)=350·30=10.500

d)=3022(102-1)+101·1978-5000·99=3022·101+101·1978-5000·99=
101(3022+1978)-5000·99=101·5000-5000·99=5000(101-99)=5000·2=10.000