Question

1.69×3.3加上16.9Ⅹ0.57+1.69的简便运算是什么利用乘法的分配律怎么算？

Answer 1

1.69×3.3+16.9×0.57+1.69
＝16.9×0.33+16.9×0.57+16.9×0.1
＝16.9×（0.33+0.57+0.1）
＝16.9×1
＝16.9

Answer 2

1.69×3.3+16.9Ⅹ0.57+1.69
=1.69×3.3+1.69Ⅹ5.7+1.69
=1.69×（3.3+5.7+1）
=1.69×10
=16.9