Question

Nhân đơn thức với đa thức ~ TOÁN 8 ~

1> 3x(12x+4)+9x(4x+3)

2> x(5+2x)+2x²(x-1)

3> x²(5x³+x-x²)

4> x(6x³+5x²-x+5)

Mik cần đáp án thôi k cần cách giải ai nhanh cho 3tick 

Answer 1

Câu 1:

\(3x\left(12x+4\right)+9x\left(4x+3\right)\)

\(\Leftrightarrow3x\left(12x+4\right)+3x\left[3.\left(4x+3\right)\right]\)

\(\Leftrightarrow3x\left(12x+4\right)+3x\left(12x+6\right)\)

\(\Leftrightarrow3x\left[12x+4+12x+6\right]\)

\(\Leftrightarrow3x.\left(24x+10\right)\)

\(\Leftrightarrow72x^2+30x\)

Câu 2:

\(x\left(5+2x\right)+2x^2\left(x-1\right)\)

\(\Leftrightarrow5x+2x^2+2x^3-2x^2\)

\(\Leftrightarrow2x^3+5x\)

Answer 2

Đề 1

Use different phrasing or notationsEnter whole words instead of abbreviationsAvoid mixing mathemaal and other notationsCheck your spellingGive your input in EnglishOther tips for using Wolfram|Alpha:Wolfram|Alpha answers specific questions rather than explaining general topicsEnter "2 cups of sugar", not "nutrition information"You can only get answers about objective factsTry "highest mountain", not "most beautiful painting"Only what is known is known to Wolfram|AlphaAsk "how many men in Mauritania", not "how many monsters in Loch Ness"Only public information is availableRequest "GDP of France", not "home phone of Michael Jordan"Examples by Topic Quick video overview

Input: 

Open code

   Inequality plot:  

Open code

 EnlargeDataCustomizeA PlaintextInteractive Alternate forms:

Open code

  

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     Expanded form:

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   Solution:Approximate form

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   Integer solution:

Open code

   

Answer 3

72x²+39x5x+2x³5x⁵6x⁴+5x³-x²+5x

Answer 4

Câu 3:

\(x\left(5x^3+x-x^2\right)\)

\(\Leftrightarrow5x^4+x^2-x^3\)

Câu 4 :

\(x\left(6x^3+5x^2-x+5\right)\)

\(\Leftrightarrow6x^4+5x^3-x^2+5x\)

Answer 5

Câu 2:

Use different phrasing or notationsEnter whole words instead of abbreviationsAvoid mixing mathemaal and other notationsCheck your spellingGive your input in EnglishOther tips for using Wolfram|Alpha:Wolfram|Alpha answers specific questions rather than explaining general topicsEnter "2 cups of sugar", not "nutrition information"You can only get answers about objective factsTry "highest mountain", not "most beautiful painting"Only what is known is known to Wolfram|AlphaAsk "how many men in Mauritania", not "how many monsters in Loch Ness"Only public information is availableRequest "GDP of France", not "home phone of Michael Jordan"Examples by Topic Quick video overviewInput:

Open code

   Inequality plot: 

Open code

   Alternate forms:

Open code

  

Open code

   Expanded form:

Open code

   Solution:Approximate form

Open code

   Number line: EnlargeDataCustomizeA PlaintextInteractive Interval notation: