Răspuns:
Explicație:
Daca a + b = 7,7 si b + c = 2,78 calculati 9a + 11b + 2c
9a+11b+2c= 9a+9b+2b+2c=9·(a+b)+2·(b+c)=9·7,7+2·2,78=
69,3+5,56= 74,86
9a+11b+2c=74,86
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Răspuns:
Explicație:
Daca a + b = 7,7 si b + c = 2,78 calculati 9a + 11b + 2c
9a+11b+2c= 9a+9b+2b+2c=9·(a+b)+2·(b+c)=9·7,7+2·2,78=
69,3+5,56= 74,86
9a+11b+2c=74,86