Решение уравнений х+2/9=5/7 х-2/3=3/5 5/8-х=1/4 4/5-х=2/7 2/3+х=2/7 1/2+х=2/7

1. x=31/63 2. x=19/25 3.x=3/8 4.x=18/35 5.x= -8/21 6.x= -3/14

х+2/9=5/7 x=5/7-2/9 x=(45-14)/63 x=31/63 -------------- х-2/3=3/5 x=3/5+2/3 x=(9+10)/15 x=19/15 x=1 4/15 --------------- 5/8-х=1/4 x=5/8-1/4 x=5/8-2/8 x=3/8 ---------------- 4/5-х=2/7 x=4/5-2/7 x=(28-10)/35 x=18/35 ------------------------ 2/3+х=2/7 x=2/7-2/3 x=(6-14)/21 x=-8/21 -------------------- 1/2+х=2/7 x=2/7-1/2 x=(4-7)/14 x=-3/14 ----------------------