(1)原式=(369×5+5×11)÷(19×28)
=5×(369+11)÷(19×28)
=25/7
(2)因为1/165-1/陵银纯157<0,-1/165-1/157<0,1/157-1/搏闹165>0
所以原式=1/165-(1/165-1/157)+(-1/165-1/157)-(1/157-1/165)
=-1/尺咐157
1.369/19*5/28+5/19*11/28
=5/19*369/28+5/源薯19*11/雹喊者28
=5/19*(369/渗滚28+11/28)
=5/19*380/28
=100/28
=25/8
第拦唯一道:
(369*5+5*11)/19*28=5*380/19*28=100/28=25/7
第二道
1/轮橡165+|1/165-1/157|-|-1/165-1/157|-|1/157-1/165|
=1/165-1/165+1/157+1/165+1/157-1/157+1/165
=1/157
汗.好像腊衡旁是我写错。