Question

2.4X4.7+8.2X5.3的简便计算怎么做?

Answer 1

2.4X4.7+8.2X5.3的简便计算怎么做?
简便方法：
2.4X4.7+8.2X5.3
=2.4×(10-5.3)+8.2×5.3
=2.4×10-2.4×5.3+8.2×5.3
=24+(8.2-2.4)×5.3
=24+5.8×5.3
=24+(6-0.2)×5.3
=24+6×5.3-0.2×5.3
=24+31.8-1.06
=55.8-1.06
=54.74
这应该是最简单的算法之一了。

Answer 2

2.4×4.7+8.2×5.3
=2.4×(5-0.3)+8.2×(5+0.3)
=2.4×5-0.3×2.4+8.2×5+0.3×8.2
=5×(2.4+8.2)+0.3×(8.2-2.4)
=5×10.6+0.3×5.8
=53+1.74
=54.74

Answer 3

2.4×4.7+8.2×5.3
=2.4×（5-0.3）+8.2×（5+0.3）
=12-2.4×0.3+41+8.2×0.3
=53+（8.2-2.4）×0.3
=53+5.8×0.3
=53+1.74
=54.74