1) 3,18 * 7,8 + 3,18 * 2,2=3,18 * 10=31,8;
2) 2 7/15 * 4/9 + 2 7/15 * 5/9=2 7/15 * (4/9+5/9)=2 7/15 * 1=2 7/15
1) 3,18 * 7,8 + 3,18 * 2,2=3,18 * 10=31,8;
2) 2 7/15 * 4/9 + 2 7/15 * 5/9=2 7/15 * (4/9+5/9)=2 7/15 * 1=2 7/15