精确计算，让每一分钱都算得清楚！
2.5 × 4 = ____
0.6 × 0.8 = ____
苹果每千克3.6元，买5千克需要____元？
1.25 × 8 = ____
2.4 × 0.5 = ____
0.5 × 2 × 1.4 = ____
1.5 × 0.04 = ____
4.8 × 9.9 ≈ ____ (估算到整数)
1.2 × 5 + 3.8 = ____
2.5 × 0.7 × 4 = ____
0.125 × 8 × 2.5 × 4 = ____
一个数的8倍是6.4，这个数是____？