Question

8
Calculează rapid, grupând convenabil termenii:
a) 372 +51 + 4 000 + 49 + 428
b) 33 + 6 + 6 000 + 445 + 67 +555 + 4
C) 42 + 9 + 3 000 +58 +91 + 638 +362 + 5
calculeaza in trei moduri​

Answer 1

Răspuns:

372+428+51+49+4000

33+67+6+4+6000+445+555

42+58+9+91+3000+638+362+5

Answer 2

372+51+4000+49+428=4000+(372+428)+(51+49)=4000+800+100=4900
33+6+6000+445+67+555+4=6000+(445+555)+(67+33)+(6+4)=6000+1000+100+10=7110
42+9+3000+58+91+638+362+5=3000+(638+362)+(42+58)+(91+9)+5=3000+1000+100+100+5=4205