Question

11.7×0.69+0.17×6.9简便运算？

11.7×0.69+0.17×6.9减便运算。

Answer 1

根据乘法分配律的扩大逆运用和乘法性质特点进行简便运算。
11.7ⅹ0.69-0.17ⅹ6.9
=11.7ⅹ069-1.7ⅹ0.69
=（11.7-1.7）ⅹ0.69
=10ⅹ0.69
= 6.9

Answer 2

11.7×0.69+0.17×6.9
＝0.69×（11.7+1.7）
＝0.69×13.4
＝9.246

Answer 3

答：依题意可知
11.7×0.69+0.17×6.9
＝6.9×（1.17+0.17）
＝6.9×1.34
＝（7-0.1）×1.34
＝7×1.34-1.34×0.1
＝9.38-0.134
＝9.246

Answer 4

仔细观察算式，有公因子可以提取出来再计算简单一些
=0.69×(11.7+0.17×10)
=0.69×(11.7+1.7)
=0.69×13.4
=9.246