Question

16．简算
3.84×7.6+0.76×61.6       
9.99×222+3.33×333+3.33．

Answer 1

分析 ①先变形为3.84×7.6+7.6×6.16，再根据乘法分配律简便计算；
②先变形为3.33×666+3.33×333+3.33×1，再根据乘法分配律简便计算．

解答 解：①3.84×7.6+0.76×61.6
=3.84×7.6+7.6×6.16
=7.6×（3.84+6.16）
=7.6×10
=76

②9.99×222+3.33×333+3.33
=3.33×666+3.33×333+3.33×1
=3.33×（666+333+1）
=3.33×1000
=3330

点评 考查了运算定律与简便运算，灵活运用所学的运算律简便计算．