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có khó j đâu mà rên rỉ, bất cứ hs trung bình nào cũng làm dc,giống như chia chia 1 số co 5 chu so cho 1 sô co 3 chu sô thui mà
11) = 2x - x +17 dư 76x +48
tự làm tip cho quen
\(\left(-3x-2\right)^2+\left(3x+5\right)\left(5-3x\right)=-7\)
\(\Leftrightarrow9x^2+12x+4+15x-9x^2+25-15x=-7\)
\(\Leftrightarrow12x+36=0\Leftrightarrow x=-3\)
\(\left(x+2\right)\left(x^2+2x+2\right)-x\left(x-8\right)^2=\left(4x-3\right)\left(4x+3\right)\)
\(\Leftrightarrow x^3+2x^2+2x+2x^2+4x+4-x\left(x^2-16x+64\right)=16x^2-9\)
\(\Leftrightarrow x^3+4x^2+6x+4-x^3+16x^2-64=16x^2-9\)
\(\Leftrightarrow4x^2+6x-51=0\)
\(\cdot\Delta=6^2-4.4.\left(-51\right)=852\)
Vậy pt có 2 nghiệm phân biệt
\(x_1=\frac{-6+\sqrt{852}}{8}\);\(x_2=\frac{-6-\sqrt{852}}{8}\)
2x2 + x3 - x - 2 = 0
=> (2x2 - 2) + (x3 - x) = 0
=> 2(x2 - 1) + x (x2 - 1) = 0
=> (x + 2) (x2 - 1) = 0
=> \(\hept{\begin{cases}x+2=0\\x^2-1=0\end{cases}}\)
=> \(\hept{\begin{cases}x=-2\\x=1\end{cases}}\) hoặc \(\hept{\begin{cases}x=-2\\x=-1\end{cases}}\)
chúc bạn học tốt!! ^^
53654645765475676585684634642364262643645764575676586589563424754754756856863
a) 2(x-1)2 - 4(x+3)2 + 2x(x-5)
= 2(x2 -2x +1)- 4(x2 + 6x +9) + 2x2 -10x
= 2x2 - 4x + 2 -4x2 - 24x - 36 + 2x2 - 10x
= (2x2 + 2x2 - 4x2) - (4x + 24x+10x) +(2-36)
= -38x-34
b) 2(2x+5)2 -3(4x+1)(1-4x)
= 2(4x2 + 20x + 25) + 3(4x+1)(4x-1)
= 8x2 +40x + 50 + 3(16x2 -1)
= 8x2 + 40x + 50 + 48x2 - 3
=56x2 +40x + 47
a, \(2\left(x-1\right)^2-4\left(x+3\right)^2+2x\left(x-5\right)\)
\(=2\left(x^2-2x+1\right)-4\left(x^2+6x+9\right)+2x\left(x-5\right)\)
\(=2x^2-4x+2-4x^2-24x-36+2x^2-10=-28x-44\)
b, \(2\left(2x+5\right)^2-3\left(4x+1\right)\left(1-4x\right)\)
\(=2\left(4x^2+20x+25\right)-3\left(1-16x^2\right)\)
\(=8x^2+40x+50-3+48x^2=56x^2+40x+47\)
a, \(x^3-4x^2+12x-27\) \(=x^3-3x^2-x^2+3x+9x-27\)
= \(x^2\left(x-3\right)-x\left(x-3\right)+9\left(x-3\right)\) \(=\left(x-3\right)\left(x^2-x+9\right)\)
b, \(x^3+2x^2+2x+1\) \(=x^3+x^2+x^2+x+x+1\)
= \(x^2\left(x+1\right)+x\left(x+1\right)+x+1=\) \(\left(x+1\right)\left(x^2+x+1\right)\)
c, \(x^4-2x^3+2x-1=\) \(x^4-x^3-x^3+x^2-x^2+x+x-1\)
= \(x^3\left(x-1\right)-x^2\left(x-1\right)-x\left(x-1\right)+x-1\)
= \(\left(x-1\right)\left(x^3-x^2-x+1\right)\)
d, \(x^4+2x^3+2x^2+2x+1=\) \(x^4+x^3+x^3+x^2+x^2+x+x+1\)
= \(x^3\left(x+1\right)+x^2\left(x+1\right)+x\left(x+1\right)+x+1\)
= \(\left(x+1\right)\left(x^3+x^2+x+1\right)\)
Ta có : x3 - 4x2 + 12x - 27
= (x3 - 27) - (4x2 - 12x)
= (x - 3)(x2 + 3x + 9) - 4x(x - 3)
= (x - 3)(x2 + 3x + 9 - 4x)
= (x - 3)(x2 - x + 9)
b) https://olm.vn/hoi-dap/question/1004349.html tôi tự coppy tôi
Bài làm
G = 2x2 - 3x + 1
G = 2x2 - 2x - x + 1
G = -( 2x2 + 2x ) - ( x + 1 )
G = -2x( x + 1 ) - ( x + 1 )
G = ( x + 1 )( -2x - 1 )
# Học tốt #
Bài làm
H = -x2 + 5x - 4
H = -x2 + 4x + x - 4
H = -( x2 - 4x ) + ( x - 4 )
H = -x( x - 4 ) + ( x + 4 )
H = ( x - 4 )( -x + 1 )
# Học tốt #
\(x^3-2x^2+2x-13\)
\(=x^3-2x^2+2x-4-9\)
\(=\left(x^3-2x^2\right)+\left(2x-4\right)-9\)
\(=x^2\left(x-2\right)+2\left(x-2\right)-9\)
\(=\left(x-2\right)\left(x^2+2\right)-9\)
\(=\left(\sqrt{\left(x-2\right)\left(x^2+2\right)}+3\right)\left(\sqrt{\left(x-2\right)\left(x^2+2\right)}-3\right)\)