3.6×15.4-7.2×2.7简便计算

分类: 作业答案 • 2022-09-26 16:32:54

问题描述：

答

3.6×15.4-7.2×2.7
=3.6x2x7.2-7.2x2.7
=7.2x7.2-7.2x2.7
=7.2x(7.2-2.7)
=7.2x4.5
=7.2x(4+0.5)
=7.2x4+7.2x0.5
=28.8+3.6
=32.4