1-(-5)×（-79/7）-5×79/9 简便运算_数学解答

1-(-5)×（-79/7）-5×79/9 简便运算

人气：320 ℃　时间：2020-04-18 11:50:29

解答

1-(-5)×（-79/7）-5×79/9
=1-5×79/7-5×79/9
=1-5×79×(1/7+1/9)
=1-395×16/63
=1-6320/63
=-6257/63