Ответы и объяснения

2014-02-16T12:08:00+00:00
1/3×+1=-1/4(×+4/5)
1/3×+1=-1/4×-1/5
1/3×+1/4×=-1/5-1
4/12×+3/12×=-1 1/5
7/12×=-1 1/5
×=- 1 1/5÷7/12=-6/5÷7/12=-6/5·12/7=-72/35
×=-2 2/35