№1 Раскройте скобки 1.- (a-b) 2.(2a+3c-4b) 3.(2-a-4n) 4.-2(3+2c) 5.3(4c-2a) 6. 5(4-2c) 7.2(3-3n+ 4m) 8.4 (a-4c+ 6d - n) №2 Раскройте скобки и найдите значение выражений: 1.5,7+(8,1-4,7) 2.3,39-(1,39-4,5) 3. 3,7-(-5,3+3,7) 4. 4,9-(4,9-2,4) 5. 6,8+(-2,8-6,8) 6.6,1+(-4,8+6,1) 7.-0,56+ (3,8 - 2,44) 8. -0,37+ (4,2 - 4,63) 9.-8,27-(-3,4 + 3,73) 10.-2,78+ (7,78 - 1,3) 11. (21,51)-(3,130,51) + (0,13 -0,5) 12.-(0,39+2,1)+(0,133 2,1) - 0,8 13. (4,3918-16,4) (4,3917-4,1.4) 14. (3,29+1)-(1,2+1)-(1-0.91) 1. x-(x -y) 2. a-(b+a) 3. (m-n)+n 4. (x + y) - y 5.5-(3+x) №3 Раскройте скобки и упростите выражение 6.-x+(x+2,7) 7.(в+3,8) + 0,7 8.4,74-(2a+3,7) №4 Раскройте скобки и упростите выражение 1. - (1-x) - (5,1 + x) 2.- (a-x-3)-(x - a + 2) 3. (a+3,3-a) (3,3 + x) 4. (c+4,9)-(5,4 + c) 5. (n-5,8) - (4,9 + n) 6. (6,08 + a)-(a+9,3) 7. (m-3,8) + (4,12+ m) 8.(2,43 + x - b) - (2.43 + b - x) 9.- (1,53-x+1) - (x - a - 2,53) 10.- (a-x)-(5,1 + x) + a - 5,1 11. (b-x) - (a-x) + (a - b) 12. (a+3,3) (x - a) - 3,3 + x 13. (2,43+1,1)-(b + 2,43) + (b - 1,1) 14. (1,53 - x + a) - (x - 1,53 - a) - a 15.- (a-1.21)-(1-a) - (0,21 - a)

Ответ: Ниже

№1 Раскройте скобки

1. \[-(a-b) = -a + b\]
2. \[-(2a+3c-4b) = -2a - 3c + 4b\]
3. \[-(2-a-4n) = -2 + a + 4n\]
4. \[-2(3+2c) = -6 - 4c\]
5. \[-3(4c-2a) = -12c + 6a\]
6. \[5(4-2c) = 20 - 10c\]
7. \[-2(3-3n+4m) = -6 + 6n - 8m\]
8. \[-4(a-4c+6d-n) = -4a + 16c - 24d + 4n\]

№2 Раскройте скобки и найдите значение выражений

1. \[5.7 + (8.1 - 4.7) = 5.7 + 3.4 = 9.1\]
2. \[3.39 - (1.39 - 4.5) = 3.39 - 1.39 + 4.5 = 2 + 4.5 = 6.5\]
3. \[3.7 - (-5.3 + 3.7) = 3.7 + 5.3 - 3.7 = 5.3\]
4. \[4.9 - (4.9 - 2.4) = 4.9 - 4.9 + 2.4 = 2.4\]
5. \[6.8 + (-2.8 - 6.8) = 6.8 - 2.8 - 6.8 = -2.8\]
6. \[-6.1 + (-4.8 + 6.1) = -6.1 - 4.8 + 6.1 = -4.8\]
7. \[-0.56 + (3.8 - 2.44) = -0.56 + 1.36 = 0.8\]
8. \[-0.37 + (4.2 - 4.63) = -0.37 - 0.43 = -0.8\]
9. \[-8.27 - (-3.4 + 3.73) = -8.27 + 3.4 - 3.73 = -8.6\]
10. \[-2.78 + (7.78 - 1.3) = -2.78 + 6.48 = 3.7\]
11. \[(2 \cdot 1.51) - (3.13 \cdot 0.51) + (0.13 - 0.5) = 3.02 - 1.5963 - 0.37 = 1.0537\]
12. \[-(0.39 + 2.1) + (0.13 \cdot 3 - 2.1) - 0.8 = -2.49 + (0.39 - 2.1) - 0.8 = -2.49 - 1.71 - 0.8 = -4.9\]
13. \[(4.3918 - 16.4) - (4.3917 - 4.1 \cdot 4) = -12.0082 - (4.3917 - 16.4) = -12.0082 + 12.0083 = 0.0001\]
14. \[(3.29 + 1) - (1.2 + 1) - (1 - 0.91) = 4.29 - 2.2 - 0.09 = 2\]

№3 Раскройте скобки и упростите выражение

1. \[x - (x - y) = x - x + y = y\]
2. \[a - (b + a) = a - b - a = -b\]
3. \[(m - n) + n = m - n + n = m\]
4. \[(x + y) - y = x + y - y = x\]
5. \[5 - (3 + x) = 5 - 3 - x = 2 - x\]
6. \[-x + (x + 2.7) = -x + x + 2.7 = 2.7\]
7. \[-(B + 3.8) + 0.7 = -B - 3.8 + 0.7 = -B - 3.1\]
8. \[4.74 - (2a + 3.7) = 4.74 - 2a - 3.7 = 1.04 - 2a\]

№4 Раскройте скобки и упростите выражение

1. \[-(1-x) - (5.1 + x) = -1 + x - 5.1 - x = -6.1\]
2. \[-(a - x - 3) - (x - a + 2) = -a + x + 3 - x + a - 2 = 1\]
3. \[(a + 3.3 - a) \cdot (3.3 + x) = 3.3 \cdot (3.3 + x) = 10.89 + 3.3x\]
4. \[(c + 4.9) - (5.4 + c) = c + 4.9 - 5.4 - c = -0.5\]
5. \[(n - 5.8) - (4.9 + n) = n - 5.8 - 4.9 - n = -10.7\]
6. \[(6.08 + a) - (a + 9.3) = 6.08 + a - a - 9.3 = -3.22\]
7. \[-(m - 3.8) + (4.12 + m) = -m + 3.8 + 4.12 + m = 7.92\]
8. \[(2.43 + x - b) - (2.43 + b - x) = 2.43 + x - b - 2.43 - b + x = 2x - 2b\]
9. \[-(1.53 - x + 1) - (x - a - 2.53) = -1.53 + x - 1 - x + a + 2.53 = a\]
10. \[-(a - x) - (5.1 + x) + a - 5.1 = -a + x - 5.1 - x + a - 5.1 = -10.2\]
11. \[(b - x) - (a - x) + (a - b) = b - x - a + x + a - b = 0\]
12. \[(a + 3.3) \cdot (x - a) - 3.3 + x = ax - a^2 + 3.3x - 3.3a - 3.3 + x = ax - a^2 + 4.3x - 3.3a - 3.3\]
13. \[(2.43 + 1.1) - (b + 2.43) + (b - 1.1) = 3.53 - b - 2.43 + b - 1.1 = 0\]
14. \[(1.53 - x + a) - (x - 1.53 - a) - a = 1.53 - x + a - x + 1.53 + a - a = 3.06 - 2x + a\]
15. \[-(a - 1.21) - (1 - a) - (0.21 - a) = -a + 1.21 - 1 + a - 0.21 + a = a\]

Ответ: Ниже