Question

Calculează în două moduri :
4/5 * (3/8 + 7/8)=
3/7 * (2/15 - 1/10)=
10 * 7/11 + 10 * 3/22 + 10 * 1/2=
DAU COROANĂ.LE VREAU FACUTE COMPLETE​

Answer 1

Răspuns:

4/5×(3/8+7/8)=4/5×10/8

simplifici 4 cu 8 si 5 cu zece si ai 2/2=1

4/5×3/8 +4/5×7/8= 1/5×3/2+ 1/5×7/2 = 3/10 + 7/10 = 10/10=1

la fel si la b)

10×7/11 + 10*3/22 + 10* 1/2=10(7/11 + 3/22 +1/2)= 10(14/22+3/22+11/22)= 10×28/22= 140/11

10×7/11 + 10*3/22 + 10* 1/2 =140/22+30/22+110/22=280/22=140/11