Question

18.5×9.7-18.2×4.7怎么用简便方法计算？

Answer 1

18.5×9.7-18.2×4.7
=(18.2+0.3)x9.7-18.2x4.7
=18.2x9.7-18.2x4.7+0.3x9.7
=18.2x(9.7-4.7)+2.91
=18.2x5+2.91
=93.91

Answer 2

18.5×9.7-18.2×4.7
=18.2x9.7+0.3x9.7-18.2x4.7
=18.2x（9.7-4.7）+0.3x9.7
=18.2x5+2.91
=91+2.91
=93.91