Question

Вычислите числовое значение алгебраического выражения при a = 1.2. b= 1.8. 1) 3(a+b) - 2ab: 2) 3a + b - 2ab 3) 3 ( a - b ) + 2ab 4) 3а - b + 2ab Вычислите числовое значение алгебраического выражения при a = 5: b = -1; 1) 2(( a - b )^2 + 1): 2) 4 ( 3 - (a - b)^2): 3) (( a - b)a-8): 2: 4) ( 5a- ( a + b )) : 3

Answer 1

1.3(1,2+1,8)-2*1,2*1,8=4,68
2.3*1,2+1,8-2*1,2*1,8=1,08
3.3(1,2-1,8)+2*1,2*1,8=2,52
4.3*1,2-1,8+2*1,2*1,8=-2,52

1)2((5+1)^2+1)=74
2)4(3-(5+1)^2)=-132
3)((5+1)5-8)2=-36
4)5*5-(5-1)/3=7

Answer 2

1. Для a = 1.2 и b = 1.8:

2. 3(a+b) - 2ab = 3(1.2 + 1.8) - 2(1.2)(1.8) = 3(3) - 2(1.2)(1.8) = 9 - 4.32 = 4.68

3. 3a + b - 2ab = 3(1.2) + 1.8 - 2(1.2)(1.8) = 3.6 + 1.8 - 4.32 = 1.08

4. 3(a - b) + 2ab = 3(1.2 - 1.8) + 2(1.2)(1.8) = 3(-0.6) + 2(1.2)(1.8) = -1.8 + 4.32 = 2.52

5. 3a - b + 2ab = 3(1.2) - 1.8 + 2(1.2)(1.8) = 3.6 - 1.8 + 4.32 = 6.12

6. Для a = 5 и b = -1:

7. 2((a - b)^2 + 1) = 2((5 - (-1))^2 + 1) = 2(6^2 + 1) = 2(36 + 1) = 2(37) = 74

8. 4(3 - (a - b)^2) = 4(3 - (5 - (-1))^2) = 4(3 - 6^2) = 4(3 - 36) = 4(-33) = -132

9. ((a - b)a - 8) / 2 = ((5 - (-1)) * 5 - 8) / 2 = (6 * 5 - 8) / 2 = (30 - 8) / 2 = 22 / 2 = 11

10. (5a - (a + b)) / 3 = (5(5) - (5 + (-1))) / 3 = (25 - 4) / 3 = 21 / 3 = 7