Tìm F:
F=3/4.8/9. ... .9999/1000
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\(\text{a)}5\left(x+2\right)-4x=17\)
\(\Rightarrow5x+10-4x=17\)
\(\Rightarrow5x-4x=17-10\)
Vậy \(x=7\)
\(\text{b)}4x+5x-x+8=128\)
\(\Rightarrow8x+8=128\)
\(\Rightarrow8x=120\)
Vậy \(x=\frac{120}{8}=15\)
mik làm câu b nha
4x+5x-x+8=128
4x+5x-x=128-8
4x+5x-x=120
4x+5x-1x=120
x.(4+5-1)=120
x.8=120
x=120:8
x=15
\(\left(4.3x-4\right)-2=18\)
\(\Rightarrow12x-4-2=18\)
\(\Rightarrow12x=24\Leftrightarrow x=2\)
a, |0,75 - x| = 2,5
=> 0,75 - x = 2,5 hoặc 0,75 - x = -2,5
=> x = -1,75 hoặc x = 3,25
vậy_
\(|0,75-x|=2,5\)
\(\Rightarrow\hept{\begin{cases}0,75-x=2,5\\0,75-x=-2,5\end{cases}\Rightarrow\hept{\begin{cases}x=-1,75\\x=3,25\end{cases}}}\)
\(A=8^2x32^4\)
\(A=\left(2^3\right)^2x\left(2^5\right)^4\)
\(A=2^6x2^{20}\)
\(A=2^{26}\)
A = \(\left(2^3\right)^2\)x \(\left(2^5\right)^4\)= \(2^6.2^{20}\)=\(2^{6+20}=2^{26}\)
C = \(\left(5^2\right)^3\) x\(\left(5^3\right)^2\)=\(5^6\)x\(5^6\)=\(5^{6+6}=5^{12}\)
Trả lời
a)2/3.x+5/7=3/10
2/3x =3/10-5/7
2/3x =29/70
x =29/70:2/3
x =87/140
b)3/4.x-1/2=3/7
3/4x =3/7+1/2
3/4x =13/14
x =13/14:3/4
x =52/42=26/21
2/3.x+5/7=3/10
2/3 . x = 3/10 - 5/7
2/3 . x = - 29/70
x = - 29/70 ÷ 2/3
x = - 87/140
3/4 . x - 1/2 = 3/7
3/4 . x = 3/7 + 1/2
3/4 . x = 13/14
x =13/14 ÷ 3/4
x =26/21
\(F=\frac{3}{4}\cdot\frac{8}{9}\cdot........\cdot\frac{9999}{1000}\)
\(F=\frac{1.3}{2.2}\cdot\frac{2.4}{3.3}\cdot....\cdot\frac{99.101}{100.100}\)
\(F=\frac{1}{2}.\frac{101}{100}=\frac{101}{200}\)
_Hắc phong_
\(\frac{3}{4}.\frac{8}{9}.....\frac{9999}{10000}\)
\(=\frac{1.3}{2.2}.\frac{2.4}{3.3}.....\frac{99.101}{100.100}\)
\(=\frac{1.2.3.....99}{2.3.4.....100}.\frac{3.4.5.....101}{2.3.4.....100}=\frac{1}{100}.\frac{101}{2}\)
\(=\frac{101}{200}\)