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Tìm x, biết:
a) \(\left(2x+3\right)\left(x-4\right)+\left(x-5\right)\left(x-2\right)=\left(3x-5\right)\left(x-4\right)\)
b) \(\left(8x-3\right)\left(3x+2\right)-\left(4x+7\right)\left(x+4\right)=\left(2x+1\right)\left(5x-1\right)\)
c) \(\left(3x-5\right)\left(7-5x\right)-\left(5x+2\right)\left(2-3x\right)=4\)
Tìm x biết :a) left(x-2right)^3+6left(x+1right)^2-x^3+120b) left(x-5right)left(x+5right)-left(x+3right)^3+3left(x-2right)^2left(x+1right)^2-left(x+4right)left(x-4right)+3x^2c) left(2x+3right)^2+left(x-1right)left(x+1right)5left(x+2right)^2-left(x-5right)left(x+1right)+left(x+4right)^2d) left(1-3xright)^2-left(x-2right)left(9x+1right)left(3x-4right)left(3x+4right)-9left(x+3right)^2
Đọc tiếp
Tìm x biết :
a) \(\left(x-2\right)^3+6\left(x+1\right)^2-x^3+12=0\)
b) \(\left(x-5\right)\left(x+5\right)-\left(x+3\right)^3+3\left(x-2\right)^2=\left(x+1\right)^2-\left(x+4\right)\left(x-4\right)+3x^2\)
c) \(\left(2x+3\right)^2+\left(x-1\right)\left(x+1\right)=5\left(x+2\right)^2-\left(x-5\right)\left(x+1\right)+\left(x+4\right)^2\)
d) \(\left(1-3x\right)^2-\left(x-2\right)\left(9x+1\right)=\left(3x-4\right)\left(3x+4\right)-9\left(x+3\right)^2\)
MM
19 tháng 6 2018 lúc 9:01
Rút gọn biểu thức sau:
a, \(\left(x-2\right)\left(x^2+2x+4\right)-\left(x+1\right)^2+3\left(x-1\right)\left(x+1\right)\)
b, \(\left(x^4-5x^2+25\right)\left(x^2+5\right)-\left(2+x^2\right)^2+3\left(1+x^2\right)^2\)
PHƯƠNG PHÁP THÊM BỚT HẠNH TỬ VÀ PHƯƠNG PHÁP ĐỔI BIẾN :
a) 4x^4+1
b) x^8+4
c) x^4+x^2+1
d) x^7+x^5+1
e) x^7+x^5-1
f) left(x+2right)left(x+4right)left(x+6right)left(x+8right)+16
g) left(x+2right)left(x+3right)left(x+4right)left(x+5right)-24
h) left(x-1right)left(x-3right)left(x-5right)left(x-7right)-20
i) left(x-1right)left(x+2right)left(x+3right)left(x+6right)-28
Đọc tiếp
PHƯƠNG PHÁP THÊM BỚT HẠNH TỬ VÀ PHƯƠNG PHÁP ĐỔI BIẾN :
a) \(4x^4+1\)
b) \(x^8+4\)
c) \(x^4+x^2+1\)
d) \(x^7+x^5+1\)
e) \(x^7+x^5-1\)
f) \(\left(x+2\right)\left(x+4\right)\left(x+6\right)\left(x+8\right)+16\)
g) \(\left(x+2\right)\left(x+3\right)\left(x+4\right)\left(x+5\right)-24\)
h) \(\left(x-1\right)\left(x-3\right)\left(x-5\right)\left(x-7\right)-20\)
i) \(\left(x-1\right)\left(x+2\right)\left(x+3\right)\left(x+6\right)-28\)
Tìm \(x\)
a) \(\left(8-5x\right)\left(x+2\right)+4\left(x-2\right)\left(x+1\right)+2\left(x-2\right)\left(x+2\right)=0\)
b) \(\left(8x-3\right)\left(3x+2\right)-\left(4x+7\right)\left(x+4\right)=\left(2x+1\right)\left(5x-1\right)-33\)
1. frac{1}{2}x^2-left(frac{1}{2}x-4right)frac{1}{2}x-14
2. 3left(1-4xright)left(x-1right)+4left(3x-2right)left(x+3right)-27
3. 6xleft(5x+3right)+3xleft(1-10xright)7
4. left(3x-3right)left(5-21xright)+left(7x+4right)left(9x-5right)44
5. left(-2+x^3right)left(-2+x^2right)left(-2+x^2right)1
Đọc tiếp
1. \(\frac{1}{2}x^2-\left(\frac{1}{2}x-4\right)\frac{1}{2}x=-14\)
2. \(3\left(1-4x\right)\left(x-1\right)+4\left(3x-2\right)\left(x+3\right)=-27\)
3. \(6x\left(5x+3\right)+3x\left(1-10x\right)=7\)
4. \(\left(3x-3\right)\left(5-21x\right)+\left(7x+4\right)\left(9x-5\right)=44\)
5. \(\left(-2+x^3\right)\left(-2+x^2\right)\left(-2+x^2\right)=1\)
Giải:
\(\)a) \(2+\dfrac{3-2x}{5}\ge\dfrac{x+3}{4}-x\)
b) \(\left|x-2\right|+3\left|1+x\right|=2\left(x-4\right)-x\)
Tìm x :
a, \(2\cdot\left(5x+1\right)-7\cdot\left(3x-2\right)=4\cdot\left(2x-1\right)+3\cdot\left(2-x\right)\)
b, \(-4\cdot\left(\dfrac{1}{2}x-3\right)+\dfrac{7}{2}\cdot\left(2x-1\right)+x=5x\cdot\left(1-x\right)\)
Tính
a)\(\left(x^4+2x^3+10x-25\right):\left(x^2+5\right)\)
b) \(\left(3x^4-8x^3-10x^2+8x-5\right):\left(3x^2-2x+1\right)\)