用简便方法计算，写出必要的计算过程．8.56×2.7+1.44×2.71.25×2.5×4×0.85.74×99+5.7472×0.03+0.3×2.8．

Question

用简便方法计算，写出必要的计算过程． 8.56×2.7+1.44×2.7	1.25×2.5×4×0.8
5.74×99+5.74	72×0.03+0.3×2.8．

Answer 1

（1）8.56×2.7+1.44×2.7
=（8.56+1.44）×2.7
=10×2.7
=27；

（2）1.25×2.5×4×0.8
=（1.25×8）×（2.5×4）
=10×10
=100；

（3）5.74×99+5.74
=5.74×（99+1）
=5.74×100
=574；

（4）72×0.03+0.3×2.8
=7.2×0.3+0.3×2.8
=（7.2+2.8）×0.3
=10×0.3
=30．