Question

109×5－9×5的简便运算？

怎么简便运算？

Answer 1

109x5-9x5
=(109-9)X5
=100X5
=500。

Answer 2

109*5-9*5=5（109-5）=5*100=500

Answer 3

109ⅹ5-9ⅹ5=(109-9)ⅹ5=500

Answer 4

（100+9）*5—9*5
=500+9*5—9*5
=500

Answer 5

=5×（109-9）
=5×100
=500