X-2/3=3/2. 2/5+x=1 2/15. (X-2/5)-0,3=2 1/4

1)х-2/3=3/2х=3/2+2/3х=2цел1/62цел1/6-2/3=3/23/2=3/2Ответ:2 цел1/62)2/5+х=12/15х=12/15-2/5х=2/52/5+2/5=12/1512/15=12/15Ответ:2/53)(х-2/5)-0,3=21/4 0,3=3/10х-2/5=21/4+0,3х-2/5=4цел19/20х=4цел19/20+2/5х=5цел7/20(5цел7/20-2/5)-0,3=21/421/4=21/4Ответ: 5цел7/20