2.22×9.9+6.66×6.7怎样简便计算
问题描述:
2.22×9.9+6.66×6.7怎样简便计算
小学五年级
答
2.22×9.9+6.66×6.7
=2.22×3×3.3+6.66×6.7
=6.66×3.3+6.66×6.7
=6.66×(3.3+6.7)
=6.66×10
=66.6