tìm x bik (3/5)^5 . x = (3/4)^7
giúp ik vs
cẻm ơn céc bẹn nhiều
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a: \(x\in\left\{-4;-3;-2;-1;0;1;2;3;4\right\}\)
Tổng là 0
b: \(x\in\left\{-6;-5;-4;-3;-2;-1;0;1;2;3;4;5;6;7\right\}\)
Tổng là 7
\(a.\dfrac{6}{7}-\dfrac{4}{21}=\dfrac{18-4}{21}=\dfrac{14}{21}=\dfrac{2}{3}\\ b.6\times\dfrac{12}{18}=\dfrac{6\times12}{18}=\dfrac{4}{1}=4\\ c.\dfrac{2}{5}\times\dfrac{3}{7}+\dfrac{2}{5}\times\dfrac{4}{7}-\left(\dfrac{3}{7}+\dfrac{4}{7}\right)\times\dfrac{2}{5}=\dfrac{7}{7}\times\dfrac{2}{5}=1\times\dfrac{2}{5}=\dfrac{2}{5}\)
a)x\(\in\left\{-5;-4;-3;-2;-1\right\}\)
b)x\(\in\left\{-2;-1;0;1;2;3\right\}\)
c)x\(\in\left\{-4;-3;-2;-1;0;1;2;3;4\right\}\)
d)x\(\in\left\{1;2;3;4\right\}\)
e)x\(\in\left\{0;1;2;3;4\right\}\)
f)x\(\in\left\{-10;-9;-8;-7\right\}\)
y:0,2 + y:0,5 + y\(\times\) 3 = 89,6
y \(\times\) 5 + y \(\times\) 2 + y \(\times\) 3 = 89,6
y \(\times\) (5 + 2 + 3) = 89,6
y \(\times\) 10 = 89,6
y = 89,6 : 10
y = 8,96
-x-2/3=-6/7
-x =-6/7+2/3
-x =-18/21+14/21
-x =-4/21
=> x=4/21
\(=\dfrac{3}{7}\cdot\left(\dfrac{4}{9}+\dfrac{5}{9}+1\right)=\dfrac{3}{7}\cdot2=\dfrac{6}{7}\)
\(=\dfrac{3}{7}\times\dfrac{4}{9}\times\dfrac{5}{9}\times\dfrac{3}{7}+\dfrac{3}{7}=\dfrac{3}{7}\times\left(\dfrac{4}{9}+\dfrac{5}{9}+1\right)=\dfrac{3}{7}\times2=\dfrac{6}{7}\)
=> 20 - 4x - 3 - 3x = - 9
=> 17 - x = - 9
=> x = 26
Vậy x = 26
K mk nha
Bài giải
\(\left(\frac{3}{5}\right)^5\cdot x=\left(\frac{3}{4}\right)^7\)
\(\frac{3^5}{5^5}\cdot x=\frac{3^7}{4^7}\)
\(x=\frac{3^7}{4^7}\text{ : }\frac{3^5}{5^5}=\frac{3^7}{4^7}\cdot\frac{5^5}{3^5}=\frac{3^2\cdot5^5}{4^7}=\frac{28125}{16384}\)