82.4×6.7+8.24×31+0.824×20的简便算法

问题描述:

82.4×6.7+8.24×31+0.824×20的简便算法

82.4×6.7+8.24×31+0.824×20
=82.4×6.7+82.4×3.1+82.4×0.2
=82.4×(6.7+3.1+0.2)
=82.4×10
=824