Question

Calculeaza rapid, folosind proprietatea de asociativitate a adunării, după model. Exemplu :72+28=70+2+28=70+(2+28)=70+30=100
a)334+66;b)127+273;c)993+2107;d)4675+1325;e)35275+24725
REPEDE DAU COROANA!!!

Answer 1

Răspuns:

a)

334 + 66 = 300 + 34 + 66 = 300 + (34 + 66) = 300 + 100 = 400

b)

127 + 273 = 100 + 27 + 200 + 73 = 100 + 200 + ( 27 + 73) = 100 + 200 + 100 = 300 + 100 = 400  

c)

993 + 2107 =  900 + 93 + 2000 + 100 + 7 = 900 + 2000 + 100 + (93+7) = 900 + 100 + 2000 + 100 = 1000 + 2000 + 10 = 3000 + 100 = 3100

d)

4675 + 1325 = 4000 + 600 + 75 + 1000 + 300 + 25 = 4000 + 1000 + 600 + 300 + (75 + 25) = 5000 + (600 + 300 + 100) = 5000 + 1000 = 6000  

e)

35275 + 24725 = 30000 + 5000 + 200 + 75 + 20000 + 4000 + 700 + 25 =

30000 + 20000 + 5000 + 4000 + 200 + 700 + (75+25) =

50000 + 9000 + (900 + 100) =

50000 + (9000 + 1000) =

50000 + 10000 =

60000