0,5+1/2=1/2+1/2=2/2=1
1/6+0,5=1/6+1/2=1/6+3/6=4/6=2/3
0,75+3/4=75/100+3/4=3/4+3/4=6/4=3/2=1=1/2
1/3+0,2=1/3+2/10=10/30+6/30=16/30=8/15
216/336+112/336=328/336=164/168=82/84=41/42
№2.
( -5) + 6 = 6 - 5 = 1
- 3/5 + 8/9 = - 27/45 + 40/45 = (40 - 27)/45 = 13/45
№3.
-3 - (-1,7) = - 3 + 1,7 = - 1,3
№4.
-8 - (- 4 ) + 3 + (4,7) = - 8 + 4 + 3 + 4,7 = - 8 +11,7 =3,7
№5.
(-2) + х - (-3) = 5
-2 + х + 3 = 5
х +1 = 5
х = 5-1
х=4
№6.
|2 -x | = 4
2 - x >=0 ⇒ 2-x = 4 ⇒ -x =4 -2 ⇒ -x= 2 ⇒ x₁= -2
2 - x < 0 ⇒ 2-x = -4 ⇒ -x = -4 -2 ⇒ -x = -6 ⇒ x₂ = 6