1. 3х - 3
2. -11
3. 7х - 1
4. -20
5. 5
6. 2х - 9
7. 2
8. 7х - 10
9. -19
10. 7х - 5
Объяснение:
1. 3(х+4) - (3-х) - х - 4 = 3х + 4 - 3 + х - х - 4 = 3х - 3
2. x + 4 - 5(2-х) - (5+1)х - 5 = х + 4 - 10 + 5х - 5х - х - 5 = 4 - 10 - 5 = -11
3. 4(x+4) - 4(3-х) - x - 5 = 4х + 16 - 12 + 4х - х - 5 = 4х + 4х - х + 16 - 12 - 5 = 7х - 1
4. x + 2 - 4(5-х) - (4+1)х - 2 = х + 2 - 20 + 4х - 4х - х - 2 = -20
5. 2(x+4) - (1-x) - (1+2)х - 2 = 2х + 8 - 1 + х - х - 2х - 2 = 8 - 1 - 2 = 5
6. x + 2 - 2(5-х) - x - 1 = х + 2 - 10 + 2х - х - 1 = 2 - 10 - 1 + 2х = -9 + 2х = 2х - 9
7. 4(x+2) - (1-x) - (1+4)х - 5 = 4х + 8 - 1 + х - х - 4х - 5 = 8 - 1 - 5 = 2
8. 4(х+2) - 4(4-x) - x - 2 = 4х + 8 - 16 + 4х - х - 2 = 4х + 4х - х + 8 - 16 - 2 = 7х - 10
9. 3(х+1) - 4(5-х) - (4+3)х - 2 = 3х + 3 - 20 + 4х - 4х - 3х - 2 = 3 - 20 - 2 = -19
10. 3(x+3) - 5(2-х) - x - 4 = 3х + 9 - 10 + 5х - х - 4 = 3х + 5х - х + 9 - 10 - 4 = 7х - 5
а) 3ab = 3ba = a3b = ab3 = b3a = ba3
б) d(-2)3c = -6cd = -6dc = -c6d = -cd6 = -d6c = -dc6
в) x7yz = x7zy = xy7z = xyz7 = xz7y = xzy7 = 7xyz = 7xzy = 7yxz = 7yzx = 7zxy = 7zyx
= y7xz = y7zx = yx7z = yxz7 = yz7x = yzx7 = z7xy = z7yx = zx7y = zxy7 = zy7x = zyx7
г) a4 = 4a
д) ab3 = a3b = 3ab = 3ba = ba3 = b3a
е) 2ak5 = 10ak = 10ka = a10k = ak10 = k10a = ka10
ж) a(-2)bc = -a2cb = -ab2c = -abc2 = -ac2b = -acb2 = -2abc = -2acb = -2bac = -2bca
= -2cab = -2cba = --b2ac = -b2ca = -ba2c = -bac2 = -bc2a = -bca2 = -c2ab = -c2ba
=-ca2b = -cab2 = -cb2a = -cba2