Question

1. Выполните действия: а) (2а2 - За + 1) - (7а2 - 5а); б) 3х (4х2 - х), в) - 5b (b7 +2b3 - 6b), г) (- 8х4 + 3х3 + х) · (- 3х2). Решите пжпжпжпжж

Answer 1

Объяснение:

Можно пожайлуста ,,лутший ответ".

Answer 2

а) (2а^2 - За) - (7а^2 - 5а)

To solve this expression, we can simplify it step by step:

1. Distribute the negative sign inside the parentheses: (2а^2 - За) - (7а^2 - 5а) = 2а^2 - За - 7а^2 + 5а

2. Combine like terms: 2а^2 - За - 7а^2 + 5а = (2а^2 - 7а^2) + (-За + 5а) = -5а^2 - 2а

Therefore, the simplified expression is -5а^2 - 2а.

б) 3х(4х^2 - х)

To solve this expression, we can use the distributive property:

1. Multiply 3х by each term inside the parentheses: 3х(4х^2 - х) = 3х * 4х^2 - 3х * х

2. Simplify each term: 3х * 4х^2 = 12х^3 3х * х = 3х^2

Therefore, the simplified expression is 12х^3 - 3х^2.

в) 5b(b^7 + 2b^3 - 6b)

To solve this expression, we can use the distributive property:

1. Multiply 5b by each term inside the parentheses: 5b(b^7 + 2b^3 - 6b) = 5b * b^7 + 5b * 2b^3 - 5b * 6b

2. Simplify each term: 5b * b^7 = 5b^8 5b * 2b^3 = 10b^4 5b * 6b = 30b^2

Therefore, the simplified expression is 5b^8 + 10b^4 - 30b^2.

г) (-8х^4 + 3х^3 + х) · (-3х^2)

To solve this expression, we can use the distributive property:

1. Multiply each term in the first expression by each term in the second expression: (-8х^4 + 3х^3 + х) · (-3х^2) = -8х^4 · (-3х^2) + 3х^3 · (-3х^2) + х · (-3х^2)

2. Simplify each term: -8х^4 · (-3х^2) = 24х^6 3х^3 · (-3х^2) = -9х^5 х · (-3х^2) = -3х^3

Therefore, the simplified expression is 24х^6 - 9х^5 - 3х^3.