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a) \(x+\frac{1}{2}=\frac{3}{4}\Rightarrow x=\frac{3}{4}-\frac{1}{2}\)\(\Rightarrow x=\frac{1}{4}\)
b)\(\frac{4}{5}\cdot x=\frac{4}{7}\Rightarrow x=\frac{4}{7}:\frac{4}{5}\)\(\Rightarrow x=\frac{5}{7}\)
c) \(8x=7,8x+25\Rightarrow8x-7,8x=25\)\(\Rightarrow0,2x=25\Rightarrow x=\frac{25}{0,2}\Rightarrow x=125\)
a. x+1/2=3/4
x =3/4 - 1/2
x = 1/4
b. 4/5.x=4/7
x =4/7 : 4/5
x = 4/7 . 5/4
x = 5/7
c. 8x=7,8+25
8x=32,8
x= 32,8 : 8
x= 4,1
a) x=\(\frac{3}{4}-\frac{1}{2}\)
=\(\frac{1}{4}\)
b)x\(=\frac{4}{7}:\frac{4}{5}\)
x\(=\frac{4}{7}.\frac{5}{4}\)
x\(=\frac{5}{7}\)
c)8x= 32,8
x=4,1
x+1/2=3/4
x=3/4-1/2
x=6/8--4/8
x=2/8=1/4
4/5.x=4/7
x=4/7:4/5
x=4/7.5/4
x=5/7
1. \(\frac{4}{5}\cdot x=\frac{4}{7}\Rightarrow x=\frac{4}{7}:\frac{4}{5}=\frac{20}{28}=\frac{5}{7}\)
Vậy \(x=\frac{5}{7}\)
2.\(8x=7,8x+25\Rightarrow8x=\frac{39}{5}x+25=1000\)
\(1000:8=125\)và \(\left(1000-25\right):\frac{39}{5}=125\)
\(\Rightarrow x=125\)
1. a) 4.415.8.25.125
= (4.25). (8.125).415
= 100.1000.415
= 100000.415
= 41500000
b) 2.31.12+4.42.6+8.27.3
= (2.31.12)+(4.42.6)+(8.27.3)
= (2.12).31+(4.6).42+(8.3).27
= 24.31+24.42+24.27
= 24 (31+42+27)
= 24.100
= 2400
Bài 2:
a: =>3/4x=-3/5-1/2=-11/10
\(\Leftrightarrow x=\dfrac{-11}{10}:\dfrac{3}{4}=\dfrac{-11}{10}\cdot\dfrac{4}{3}=-\dfrac{44}{30}=-\dfrac{22}{15}\)
b: \(\Leftrightarrow x+\dfrac{3}{4}x=\dfrac{1}{3}+\dfrac{5}{4}=\dfrac{19}{12}\)
=>7/4x=19/12
=>x=19/21
c: \(\Leftrightarrow-\dfrac{2}{3}x+\dfrac{1}{6}=\dfrac{2}{3}x-\dfrac{1}{3}\)
=>-4/3x=-1/3-1/6=-1/2
=>x=1/2:4/3=1/2x3/4=3/8
Bài 1
\(\dfrac{1}{7}:\dfrac{5}{17}-\dfrac{3}{2}.\left(\dfrac{1}{6}-\dfrac{7}{12}\right)\)
\(\dfrac{1}{7}.\dfrac{17}{5}-\dfrac{3}{2}.\left(-\dfrac{5}{12}\right)\)
\(\dfrac{17}{35}-\left(-\dfrac{5}{8}\right)\)
\(\dfrac{17}{35}+\dfrac{5}{8}\)
\(\dfrac{311}{280}\)
\(a,8x-75=5x+21\)
\(8x-5x=21+75\)
\(3x=96\)
\(x=32\)
\(b,9x+25=-\left(2x-58\right)\)
\(9x+25=-2x+58\)
\(9x+2x=58-25\)
\(11x=33\)
\(x=3\)
\(c,\left(5-x\right).\left(x+2\right)=0\)
\(\Rightarrow\orbr{\begin{cases}5-x=0\\x+2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-2\end{cases}}}\)
\(a.x=\frac{3}{4}-\frac{1}{2}=\frac{1}{4}\)
\(b.x=\frac{4}{7}:\frac{4}{5}=\frac{5}{7}\)
\(c.8x-7,8x=25\)
\(0,2x=25\Rightarrow x=125\)