Выражение: 6.2*(3-2*x)=20-(12.4*x+1.4)
Ответ: 0=0
Решаем по действиям:
1. 6.2*(3-2*x)=18.6-12.4*x
6.2*(3-2*x)=6.2*3-6.2*2*x
1.1. 6.2*3~~18.6
X6.2
_ _3_ _
18.6
1.2. 6.2*2=12.4
X6.2
_ _2_ _
12.4
2. 18.6-20=-1.4
-20.0
_1_8_._6_
-01.4
3. -12.4*x+12.4*x=0
4. -1.4+1.4=0
-1.4
_1_._4_
0.0
Решаем по шагам:
1. 18.6-12.4*x-20+12.4*x+1.4=0
1.1. 6.2*(3-2*x)=18.6-12.4*x
6.2*(3-2*x)=6.2*3-6.2*2*x
1.1.1. 6.2*3~~18.6
X6.2
_ _3_ _
18.6
1.1.2. 6.2*2=12.4
X6.2
_ _2_ _
12.4
2. -1.4-12.4*x+12.4*x+1.4=0
2.1. 18.6-20=-1.4
-20.0
_1_8_._6_
-01.4
3. -1.4+1.4=0
3.1. -12.4*x+12.4*x=0
4. 0=0
4.1. -1.4+1.4=0
-1.4
_1_._4_
0.0
8Y^2 - 2Y - 2*( 9 - 12Y + 4Y^2) = 48
8Y^2 - 2Y - 18 + 24Y - 8Y^2 = 48
22Y = 66
Y = 3