Question

8.75×9+87.5的简便运算怎么算？

Answer 1

8.75×9+8.75用简便运算的方法。原式子可以变成8.75×9+8.75×1。提取公因式8.75。变成8.75×9+1。答案是87.5。

Answer 2

8.75×9+87.5
=8.75×（10-1）+87.5
=8.75×10-8.75+87.5
=87.5+87.5-8.75
=175-8.75
=166.25

Answer 3

8.75×（10-1）+87.5
＝87.5-8.75+87.5
＝87.5×2-8.75
＝175-8.75
＝165+10-8.75
＝165+1.25＝166.25

Answer 4

由题目可得式子8.75*9+87.5，在这个式子中8.75可以看成87.5*0.1，8.75*9+87.5＝87.5*0.1*9+87.5＝87.5*0.9+87.5＝87.5*(1+0.9)＝87.5*(2-0.1)＝87.5*2-87.5*0.1＝175-8.75＝166.25

Answer 5

8.75×9+87.5
=8.75×(10－1)+87.5
=87.5－8.75+87.5
=87.5+87.5-8.75
=87.5×2－87.5×(1－0.9)
=87.5×(2－1+0.9)
=87.5×1.9
=166.25