a: \(\Leftrightarrow4x^2+8xy+4y^2+x^2+2x+1+y^2-2y+1=0\)
=>4(x+y)^2+(x+1)^2+(y-1)^2=0
=>x=-1 và y=1
b: =>\(\left(x^2-7x+10\right)\left(x^2-7x+12\right)+1=0\)
=>\(\left(x^2-7x\right)^2+22\left(x^2-7x\right)+121=0\)
=>\(\left(x^2-7x+11\right)^2=0\)
hay \(x\in\left\{\dfrac{7+\sqrt{5}}{2};\dfrac{7-\sqrt{5}}{2}\right\}\)
Tìm x:
1, \(\left(x-5\right)\cdot\left(x+5\right)-\left(x+3\right)^2=2x-3\)
2,\(\left(2x+3\right)^2+\left(x-1\right)\cdot\left(x+1\right)=5\cdot\left(x+2\right)^2\)
3, \(\left(x-4\right)^3-\left(x-5\right)\cdot\left(x^2+5x+25\right)=\left(x+2\right)\cdot\left(x^2-2x+4\right)-\left(x+4\right)^3\)
Mọi người yêu dấu ơi~Xin hãy giúp mình giải bài này với a~Mình sẽ tick~Like và Bình luận cho mina a~
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Tìm x
a,\(\left(x+2\right).\left(x^2-2x+4\right)-\left(x^2+x\right)=15\)
b,\(\left(x+3\right)^3-x.\left(3x+1\right)^2+\left(2x+1\right),\left(4x^2-2x+1\right)=28\)c,\(\left(x^2-1\right)^3-\left(x^4+2x+1\right).\left(x^2-1\right)=0\)
d,\(\left(x-1\right).\left(x^3+x+1\right)-x\left(x-2\right).\left(x+2\right)=5\)
e,\(\left(x-1\right)^3-\left(x+3\right).\left(x^2-3x+9\right)+3\left(x^2-4\right)=2\)
f,\(\left(x-3\right)^3-\left(4x+3\right)^2+\left(3x-1\right).\left(9x^2+3x+1\right)=4.\left(3x^3-7\right)\)
Cảm ơn các bạn nhiều lắm a~
Tìm x biết :
a)\(\left(2x+5\right)^3-\left(x+2\right)^3-\left(x+3\right)^3=0\)
b)\(\left(x+7\right)^3-\left(2x+13\right)^3+\left(x+6\right)^3=0\)
Thu gọn biểu thức
1,\(\left(x-2\right)^3-\left(2x+3\right)^3-7\cdot\left(1-x\right)^3\)
2,\(\left(x+5\right)\cdot\left(x^2-5x+25\right)-\left(x-2\right)\cdot\left(x^2+2x+4\right)\)
3, \(\left(2x-3\right)\cdot\left(4x^2+6x+9\right)-\left(2x+1\right)^3\)
Tìm x :
1, \(\left(3x+2\right)^2-\left(2x-1\right)\cdot\left(2x+1\right)=5\cdot\left(x-2\right)^2\)
2, \(\left(x+2\right)^2-\left(x+3\right)\cdot\left(x-1\right)=5x\)
3, \(\left(3x-1\right)\cdot\left(x-3\right)+\left(x-2\right)^2=\left(2x-5\right)^2\)
Tìm x :
\(\left(x-4\right)^3-\left(x-5\right)\cdot\left(x^2+5x+25\right)=\left(x+2\right)\cdot\left(x^2-2x+4\right)-\left(x+4\right)^3\)
Rút gọn
a) \(\left(x^2-1\right)^3-\left(x^4+x^2+1\right)\left(x^2-1\right)\)
b) \(\left(x^4-3x^2+9\right)\left(-x^2+3\right)-\left(3+x^2\right)^3\)
c) \(\left(x+y\right)^3-\left(x-y\right)^3-6x^2y\)
Thu gọn biểu thức :
1, \(\left(x+5\right)\cdot\left(x^2-5x+25\right)-\left(x-2\right)\cdot\left(x^2+2x+4\right)\)
2, \(\left(2x-3\right)\cdot\left(4x^2+6x+9\right)-\left(2x+1\right)^3\)
Bài 1: Tìm x:
a) \(x^2+3y^2+2z^2-2x+12y+4z+15=0\)
Bài 2: Tìm Min
\(A=x^2-4xy+5y^2+10x-22y+28\)
\(B=\left(x-1\right)\left(x-2\right)\left(x-3\right)\left(x-4\right)+15\)
