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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Tính : 1, -b ³+6b ²-12b+8 2,(2x+3)(4x ²-6x+9) 3. (3x/y-2y/x) ³

Home/ Toán Lớp 8: Tính : 1, -b ³+6b ²-12b+8 2,(2x+3)(4x ²-6x+9) 3. (3x/y-2y/x) ³

Toán Lớp 8: Tính : 1, -b ³+6b ²-12b+8 2,(2x+3)(4x ²-6x+9) 3. (3x/y-2y/x) ³

Tháng Tám 28, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: Tính :
1, -b ³+6b ²-12b+8
2,(2x+3)(4x ²-6x+9)
3. (3x/y-2y/x) ³

Comments ( 1 )

  1. diemmyhoa
    diemmyhoa
    28 Tháng Tám, 2022 at 11:13 sáng
    Reply
    $\begin{array}{l}1.-b^3+6b^2-12b+8 \\= – (b^3-6b^2+12b-8)\\=-(b-2)^3\\ 2.(2x+3)(4x^2-6x+9)\\=(2x+3)[(2x)^2-2x.3+3^2]\\=(2x+3)^3\\ 3.\left(\dfrac{3x}y-\dfrac{2y}x\right)^3\\=\left(\dfrac{3x}y-\dfrac{2y}x\right)\left(\dfrac{9x^2}{y^2}+\dfrac{3x^2}{2y^2}+\dfrac{4y^2}{x^2}\right)\end{array}$

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222-9+11+12:2*14+14 = ? ( )

Khánh Ngân

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