Ответ:\(3.15 \cdot 4 = 12.60 = 12.6\)\(12.6 \cdot 7 = 88.2\)\(0.24 \cdot 9 = 2.16\)\(5.08 \cdot 6 = 30.48\)Ответ: 12,6; 88,2; 2,16; 30,48.