1) -2/5 - (3.7 - 2.2)-2/5 - 1.5= -2/5 - 3/2= (-22 - 53)/(5*2)= (-4 - 15)/10= -19/10
Ответ: -19/10
2) 3(2x + 4)/4 = 4x - 3/26x + 12 = 16x - 3/212 + 3/2 = 16x - 6x27/2 = 10xx = 27/20
Ответ: x = 27/20
3) 4 + (x + 2) - (x - 2)4 + x + 2 - x + 2= 8
Подставляем x = 0.5:4 + (0.5 + 2) - (0.5 - 2)= 4 + 2.5 - 1.5= 6
Ответ: 6
1) -2/5 - (3.7 - 2.2)
-2/5 - 1.5
= -2/5 - 3/2
= (-22 - 53)/(5*2)
= (-4 - 15)/10
= -19/10
Ответ: -19/10
2) 3(2x + 4)/4 = 4x - 3/2
6x + 12 = 16x - 3/2
12 + 3/2 = 16x - 6x
27/2 = 10x
x = 27/20
Ответ: x = 27/20
3) 4 + (x + 2) - (x - 2)
4 + x + 2 - x + 2
= 8
Подставляем x = 0.5:
4 + (0.5 + 2) - (0.5 - 2)
= 4 + 2.5 - 1.5
= 6
Ответ: 6