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Calculează ,grupand convenabil termenii :
a) 131+128+143+119+122+107 =
b) 224+315+222+216+125+218 =


Răspuns :

a)
131+128+143+119+122+107 =
(131+119)+(128+122)+(143+107)=
250+250+250=
500+250=
750



b)
224+315+222+216+125+218 =
(224+216)+(315+125)+(222+218)=
440+440+440=
880+440=
1 320