Question

小学四年级数学题 简便运算

986×89-987×88 需过程

Answer 1

986×89-987×88

=986×89-986×88 -88

=986×（89-88）-88

=986-88

=986-100+12

=898

Answer 2

986×89-987×88
=986×(88+1)-(986+1)×88
=986X88+986-986X88-88
=986-88
=898

Answer 3

=986×88+986-986×88-88
=986-88
=898

Answer 4

986×89-987×88
=986×（88+1）-（986+1）×88
=986×88+986-986×88-88
=986-88
=986-86-2
=900-2
=898

Answer 5

=986×88+986-986×88-88
=986-88
=898 （我是3年级的尖子）