Tìm x biết : \(\left(\frac{1}{3}\right)^x\left(\frac{1}{9}\right)^x\left(\frac{1}{27}\right)^x\left(\frac{1}{81}\right)^x\left(\frac{1}{243}\right)^x=\left(-\frac{1}{3}\right)^{30}\)
Tìm x :
\(\left|x-1\right|+\left|x-2\right|+\left|x-3\right|+\left|x-4\right|+\left|2x-5\right|=4\)
\(\left|x+1\right|+\left|x+2\right|+\left|x-1\right|+\left|x-5\right|+\left|3x+2\right|=9\)
Mình đag cần rất gấp. mọi ng giúp mình với
\(\left(3-x\right)^3=-\dfrac{27}{64};\left(x-5\right)^3=\dfrac{1}{-27};\left(x-\dfrac{1}{2}\right)^3=\dfrac{27}{8};\left(2x-1\right)^2=\dfrac{1}{4};\left(2-3x\right)^2=\dfrac{9}{4};\left(1-\dfrac{2}{3}\right)^2=\dfrac{4}{9}\)
Tìm Tmin= \(\left|x-1\right|+\left|x+2\right|+\left|x-3\right|+\left|x+4\right|+...+\left|x-9\right|\)
5 coin cho ng trl đúng
Bài 1 :Rút gọn
\(\left(4x^2-3y\right)a2y-\left(3x^2-4y\right)3y\)
\(4x^2\left(5x-3y\right)-x^2\left(4x+y\right)\)
\(2ax^2-a\left(1+2x^2\right)-\left\{a-x\left(x+a\right)\right\}\)
Bài 2:Tìm x
a)\(2x\left(x+1\right)-x^2\left(x+2\right)+x^3-x+1=0\)
b)\(4x\left(3x+2\right)-6x\left(2x+5\right)+21\left(x-1\right)=0\)
Bài 3:Rút gọn
\(x\left(1+x+x^2+...+x^9\right)-\left(1+x+x^2+...+x^9\right)\)
Tìm giá trị nhỏ nhất của biểu thức:
\(T=\left|x-1\right|+\left|x+2\right|+\left|x-3\right|+\left|x+4\right|+\left|x-5\right|+\left|x+6\right|+\left|x-7\right|+\left|x+8\right|+\left|x-9\right|\)
Rút gọn các biểu thức:
\(A=\left(x+3\right)\left(x^2-3x+9\right)-\left(54+x^3\right)\)
\(B=\left(2x+y\right)\left(4x^2-2xy+y^2\right)-\left(2x-y\right)\left(4x^2+2xy+y^2\right)\)
\(C=\left(2x+1\right)^2+\left(1-3x\right)^2+2\left(2x+1\right)\left(3x-1\right)\)
\(D=\left(x-2\right)\left(x^2+2x+4\right)-\left(x+1\right)^3+3\left(x-1\right)\left(x+1\right)\)
Thu gọn:
\(B=\left(x-3\right)\left(x+3\right)\left(x^2+9\right)-\left(x^2+2\right)\left(x^2-2\right)\)
\(T=\left(x-5\right)\left(x+2\right)+3.\left(x-2\right)\left(x+2\right)-\left(3x-\frac{1}{2}\right)^2+5x^2\)
\(Q=\left(x-2\right)^3+6\left(x-1\right)^2-\left(x+1\right)\left(x^2-x+1\right)\)
Làm đc cái nào thì làm, ko bắt m.n làm cả đâu ! Làm đc hết thì mk cảm ơn!
Tìm x:
1) \(\text{(x−1):0,16=−9:(1−x)}\)
2) \(\left(\left|x\right|-\dfrac{3}{2}\right)\left(2x^2-10\right)=0\)
3)\(8\sqrt{x}=x^2\left(x\ge0\right)\)