Решите Уровнение
6.7-x=3.9
x+6.9=7.2
(x-5.4)+2.3=5.2
(9.1-x)-2.8=2.9
1. -х=3.9-6.7
1)6.7-x=3.9 х=3.9-6.7 х=-2.8 2)x+6.9=7.2 х=7.2-6.9 х=0.3 3)(x-5.4)+2.3=5.2 х-5.4=5.2-2.3 х=2.9+5.4 х=8.3 4)(9.1-x)-2.8=2.9 9.1-х=2.9+2.8 х=5.7-9.1 х=-3.4