> 数学 >
实数a
人气:301 ℃ 时间:2020-02-16 11:40:28
解答
( a" + b" ) / ( a + b )= ( a" + 2ab + b" - 2ab ) / ( a + b )= [ ( a + b )" - 2 ] / ( a + b )= ( a + b )" / ( a + b ) - 2 / ( a + b )= - ( a + b ) - 2/(a + b)
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版