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calculeaza in doua moduri:7*(3+5)= 8*(15+27) 4*(309+584)=

Răspuns :

a) 7x (3+5)= 7 x 8= 56
     7 x (3+5)= 7x3+ 7x5=21+35=56
b) 8x(15+27)= 8 x 42= 336
     8x(15+27)= 8x15 + 8x27=120+216=336
c)   4x(309+584)= 4x893= 3572
       4 x (309+584)= 4x309 + 4x584= 1236+2336=3572
7*(3+5)=56
3+5=8
7*8=56

8*(15+27)=336
15+27=42
8*42=336

4*(309+584)=3572
309+584=893
4*893=3572