\(\left(3x+1\right)^3=-8\)
\(\Rightarrow\left(3x+1\right)^3=\left(-2\right)^3\)
\(\Rightarrow3x+1=-2\)
\(\Rightarrow3x=\left(-2\right)-1\)
\(\Rightarrow3x=-3\)
\(\Rightarrow x=\left(-3\right):3\)
\(\Rightarrow x=-1\)
Vậy \(x=-1.\)
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Ôn tập chương 1
Các câu hỏi tương tự
Tìm x:
1) -3.(1-2x) - 4.(1+3x) = -5x + 5
2) 3.(2x - 5) - 6.(1 - 4x) = -3x + 7
3) (1 - 3x) - 2.(3x - 6) = -4x - 5
4) x.(4x - 3) - 2x.(2x - 1) = 5x - 7
5) 3x.(2x - 1) - 6x.(x + 2) = -3x + 4
6) (1 - 2x).3 - 4.(6x - 1) = 7x - 5
7) 6x - 3.(1 - 4x) - 5.(x + 1) = 2x + 7
8) 6.(1 - 3x) - 3.(2x + 5) = -10x + 7
9) 3x.(1 - 2x) + 6x^2 - 7x = 8.(1 - 2x) - 9
10) 2x.(1 + 3x) - 3x.(4 + 2x) = 3x - 4
TV
26 tháng 12 2021 lúc 10:34
Cho \(\dfrac{3x-2y}{4}=\dfrac{4y-3z}{2}=\dfrac{2z-4x}{3}\) và \(x-2y+3z=8\)
Tìm x, y, z
a,2^12.3^54^6.81/(2^2.3)^6+8^4.3^5
b, 4.(-1/2)^3-2.(-1/2)^2+3.(-1/2)+1
c, 5x-7=3x+9
d, 5x-|9-7x|=3
e, -5+|3x-1|+6=|-4|
g, (x-1)^2=(x-1)^4
h, 5^-1.25=125
i, |x+1|+|x+2|+|x+3|=4x
3x-7/8=5/2 : tìm x trong tỷ lệ thức
Giúp vs
Bài 1. Tìm x biết
a) (x+3)3=640000
b) 275.3x=910
c) (1/33.9).3x=27
d) 85.4x=221
Bài 2. Tính
M=22010-(22009+22008+...+21+20)
Cần giúp nhanh vsBài 1. Tìm xa) left|x+dfrac{7}{4}right|dfrac{1}{2}b) left|2x+1right|-dfrac{2}{5}dfrac{1}{3}c) 3x.left(x+dfrac{2}{3}right)0d) x+dfrac{1}{3}dfrac{2}{5}-left(-dfrac{1}{3}right)Bài 2. Tính nhanhAdfrac{1}{100}-dfrac{1}{100.99}-dfrac{1}{99.98}-dfrac{1}{98.97}-....-dfrac{1}{3.2}-dfrac{1}{2.1}
Đọc tiếp
Cần giúp nhanh vs
Bài 1. Tìm x
a) \(\left|x+\dfrac{7}{4}\right|=\dfrac{1}{2}\)
b) \(\left|2x+1\right|-\dfrac{2}{5}=\dfrac{1}{3}\)
c) \(3x.\left(x+\dfrac{2}{3}\right)=0\)
d) \(x+\dfrac{1}{3}=\dfrac{2}{5}-\left(-\dfrac{1}{3}\right)\)
Bài 2. Tính nhanh
\(A=\dfrac{1}{100}-\dfrac{1}{100.99}-\dfrac{1}{99.98}-\dfrac{1}{98.97}-....-\dfrac{1}{3.2}-\dfrac{1}{2.1}\)
a) dfrac{2}{3}x + 0,25 -dfrac{5}{8} - left(dfrac{1}{2}-dfrac{3}{4}xright)
b) ( 9x^2 -1 ) . ( 2x + 3 ) 0
c) left|2x-dfrac{1}{3}right|-dfrac{3}{4}left|-dfrac{5}{6}right|
d) left(0,75-dfrac{5}{6}xright)^3 -dfrac{27}{64}
e) left(dfrac{2}{5}x-dfrac{1}{2}right)^2dfrac{9}{16}
f) dfrac{2x-3}{3}dfrac{3x+2}{7}
h)left(dfrac{2}{3}right)^{2x+1} left(dfrac{8}{27}right)^3
i) 2.5^{3x}+5^{3x+2}3375
Đọc tiếp
a) \(\dfrac{2}{3}\)x + 0,25 = \(-\dfrac{5}{8}\) - \(\left(\dfrac{1}{2}-\dfrac{3}{4}x\right)\)
b) ( \(9x^2\) -1 ) . ( 2x + 3 ) = 0
c) \(\left|2x-\dfrac{1}{3}\right|-\dfrac{3}{4}=\left|-\dfrac{5}{6}\right|\)
d) \(\left(0,75-\dfrac{5}{6}x\right)^3\) = \(-\dfrac{27}{64}\)
e) \(\left(\dfrac{2}{5}x-\dfrac{1}{2}\right)^2=\dfrac{9}{16}\)
f) \(\dfrac{2x-3}{3}=\dfrac{3x+2}{7}\)
h)\(\left(\dfrac{2}{3}\right)^{2x+1}\) = \(\left(\dfrac{8}{27}\right)^3\)
i) \(2.5^{3x}+5^{3x+2}=3375\)
tìm x biết
1)left(1-2xright)^29
2)left(x+5right)^3-64
3)left(3x-5right)^216
4) left(x-1right)^327
5)x^2+x0
6)5^{x+2}625
7) 5-left|3x-1right|3
8) left|2x-1right|+54
9)left|dfrac{1}{3}-xright|-1dfrac{2}{3}
Đọc tiếp
tìm x biết
1)\(\left(1-2x\right)^2=9\)
2)\(\left(x+5\right)^3=-64\)
3)\(\left(3x-5\right)^2=16\)
4) \(\left(x-1\right)^3=27\)
5)\(x^2+x=0\)
6)\(5^{x+2}=625\)
7) \(5-\left|3x-1\right|=3\)
8) \(\left|2x-1\right|+5=4\)
9)\(\left|\dfrac{1}{3}-x\right|-1=\dfrac{2}{3}\)
1/ Tính M=\(\dfrac{8^{20}+4^{20}}{4^{25}+64^5}\)
2/ Tìm x,y,z biết:
\(\dfrac{x}{2}\): -y : z = 3:5:8 và 3x+y-2z=14
Giải nhanh giùm mk nha!!!