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a fost răspuns

Calculati cat mai simplu:
1/11 x 1/7 + 1/11 x 1/14 + 1/11 x 1/21

Răspuns :

Ielenaaaa
1/11 ×1/7 +1/11×1/2×7+1/11×1/3×7= 1/11×1/7 (1+1/2+1/3)= 1/11×1/7×11/6=1/7×1/6=1/42
1/11×1/7+1/11×1/14+1/11×1/21= 1/11×(1/7+1/14+1/21)= 1/11×(2/14+1/14+1/21)= 1/11×(3/14+1/21)= 1/11×(9/42+2/42)= 1/11×11/42= 11/462=1/42-se simplifica prin 11 =1//42

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