\(2.\left(x-4\right)+\dfrac{2}{3}.\left(x-3\right)=5\)
\(2x-8+\dfrac{2}{3}x-2=5\)
\(\dfrac{8}{3}x-10=5\)
\(\dfrac{8}{3}x=15\)
\(x=\dfrac{45}{8}\)
Vậy \(x=\dfrac{45}{8}\)
Cho hai đa thức P( x ) = x mũ 2 cộng 5 x mũ 4 trừ 3 x mũ 3 cộng x mũ 2 cộng 4 x mũ 4 + 3 x mũ 3 - x + 5
Q(x) = x - 5 x mũ 3 trừ x mũ 2 trừ x mũ 4 + 4 x mũ 3 trừ x mũ 2 + 3 x - 1
2 TÌM X BIẾT
a, (5x+1)^2 = 36/49
b, (12/25)^x =(5/3)^2 -(-3/5)^4
c, (-3/4)^ 3x-1 = 256/81
d, 172 .x ^2 -7^9 :98^3 =2^3
e,5^x .(5^3)^2 =625
f, (x-2/9)^3 =(2/3)^6
Tìm x
1; 5.| x + 2|= 10. (-2)
2; - 4| x - 2| = 8
3; 2. ( x - 5) - 3. ( x + 7) = 12
4; 7. ( 5 - x ) - 2. ( x + 3 ) = 15
Bài 1 : Tìm x biết :
a) x + 2 / 3 = y - 7 / 5 và x + y = 21
b) x + 5 / 2 = y - 2 / 3 và x - y + -10
c) 2 . x / 3 = 3 . y / 4 = 5 . z /6 và x - y + z = 41
d) x : y : z = 2 / 3 : 3 / 5 : 3 / 4
c)5^x+1-5^x=20 c)2^x+2^x+4=544 c)4^2x+1+4^2x=80 c)3^2x+2+3^2x+1=108 c)7^x+3-7^x+1=16464
a, x/3=y/4=z/5 va x+y=16
b,x/4+y/3+z/5 va 2x+3y=-51
c,x/2=y/3=z/4 va x^2+y^2=52
d, x/3=y/4 va x^3 -y^3 =-37
Tìm x,biết:
1) |x+2| + |x-5| = 7
2) |x-7| + 2x+5 =6
3) |2x + 1| +|x+3| = 4x
4) |x2 -2x| = x
5) |2x+3| = x+2
6) |5x-4 |= |x+2|
7) |x-2| - |2x - 3| - x = 2
Bài 1: Thu gọn
a) \(\frac{1}{5}x^4y^3-3x^4y^3\)
b) \(5x^2y^5-\frac{1}{4}x^2y^5\)
c) \(\frac{1}{7}x^2y^3.\left(-\frac{14}{3}xy^2\right)-\frac{1}{2}xy.\left(x^2y^{\text{4}}\right)\)
d) \(\left(3xy\right)^2.\left(-\frac{1}{2}x^3y^2\right)\)
e) \(-\frac{1}{4}xy^2+\frac{2}{5}x^2y+\frac{1}{2}xy^2-x^2y\)
f) \(\frac{1}{2}x^4y.\left(-\frac{2}{3}x^3y^2\right)-\frac{1}{3}x^7y^3\)
g) \(\frac{1}{2}x^2y.\left(-10x^3yz^2\right).\frac{1}{4}x^5y^3z\)
h) \(4.\left(-\frac{1}{2}x\right)^2-\frac{3}{2}x.\left(-x\right)+\frac{1}{3}x^2\)
i) \(1\frac{2}{3}x^3y.\left(\frac{-1}{2}xy^2\right)^2-\frac{5}{4}.\frac{8}{15}x^3y.\left(-\frac{1}{2}xy^2\right)^2\)
k) \(-\frac{3}{2}xy^2.\left(\frac{3}{4}x^2y\right)^2-\frac{3}{5}xy.\left(-\frac{1}{3}x^4y^3\right)+\left(-x^2y\right)^2.\left(xy\right)^2\)
n) \(-2\frac{1}{5}xy.\left(-5x\right)^2+\frac{3}{4}y.\frac{2}{3}\left(-x^3\right)-\frac{1}{9}.\left(-x\right)^3.\frac{1}{3}y\)
m) \(\left(-\frac{1}{3}xy^2\right)^2.\left(3x^2y\right)^3.\left(-\frac{5}{2}xy^2z^3\right)^{^2}\)
p) \(-2y.\left|2\right|x^4y^5.\left|-\frac{3}{4}\right|x^3y^2z\)
a) 2 mũ 3 : |x-2| =2
b) | 2x + 1 | + | 5x -1 | + 7 mũ 4 = 49
c) | x mũ 3 ( x - 4 )= 5x mũ 2
d) | 2x - 5 | = 2 - x
e) x - | x + 1 | = 4
f) 3x + | 4x + 3 | = 5
1.Tìm số hữu tỉ x:
a)\(4^{x+2}.3^x=16.12^5\)\(\)
b)\(\dfrac{3}{2}.4x+\dfrac{5}{3}.4^{x+2}=\dfrac{3}{2}.4^8+\dfrac{5}{3}.4^{10}\)
