4/7×(-5/23)+3/7×(-5/23)-5/23×16/7
= 5/23 x ( -4/7 - 3/7 - 16/7 )
= 5/23 x ( -4-3-16) /7
= 5/23 x ( -23 /7 )
= - 7分之5好吧谢谢了