15.2×7.8+2.2×15.2的简便算法
问题描述:
15.2×7.8+2.2×15.2的简便算法
答
=15.2×(7.8+2.2)
=15.2×10
=152
15.2×7.8+2.2×15.2的简便算法
=15.2×(7.8+2.2)
=15.2×10
=152