Question

7.23x9.9+0.723,用简便方法计算

Answer 1

7.23x9.9+0.723
解：
=7.23x9.9+7.23x0.1 运用乘法分配律
=（9.9+0.1）x7.23
=10x7.23
=72.3
祝学习进步。

Answer 2

7.23x9.9+0.723
=0.723(9.9x10+1)
=0.723x(99+1)
=0.723x100
=72.3