8,75x X + 1,25x X=2
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8,75 * x + 1,25 * x = 20
8,75 * x + 1,25 * x = 20
x = 20 : ( 8,75 + 1,25 )
x = 20 : 10
x = 2
=8.75+1.25)xX=2
10xX=2
X=2:10
X=0.2
đún thì cho mk nhé
chúc bạn học tốt
8,75 x X + 1,25 x X = 2
X x ( 8,75 + 1,25 ) = 2
X x 10 = 2
X = 2 : 10
X = 0,2
8,75 x X +1,25 x X = 280
X x [ 8,75 + 1,25 ] = 280
X x 10 = 280
X = 280 / 10
X = 28
( 8,75 + 1,25 ) x X = 20
10 x X = 20
X = 20 : 10
X = 2
a) \(7,5.x:\left(8-\frac{118}{21}\right)=\frac{43}{15}\)
\(\frac{15}{2}.x:\frac{50}{21}=\frac{43}{15}\)
\(\frac{15}{2}.x.\frac{21}{50}=\frac{43}{15}\)
\(\frac{63}{20}.x=\frac{43}{15}\)
\(x=\frac{43}{15}:\frac{63}{20}\)
\(x=\frac{172}{189}\)
b) \(3.\left(x-\frac{1}{2}\right)-2.\left(x+1\right)=1,25.x-1\)
\(3x-\frac{3}{2}-2x-2=\frac{5}{4}.x-1\)
\(\Rightarrow3x-2x-\frac{5}{4}x=(-1)+\frac{3}{2}+2\)
\(x.\left(3-2-\frac{5}{4}\right)=\frac{5}{2}\)
\(x.\frac{\left(-1\right)}{4}=\frac{5}{2}\)
\(x=\frac{5}{2}:\left(\frac{-1}{4}\right)\)
\(x=-10\)
a: =>9x^2+6x+1-6(2x^2-13x+21)=0
=>9x^2+6x+1-12x^2+78x-126=0
=>-3x^2+84x-125=0
=>\(x\in\left\{26.42;1.58\right\}\)
b: =>(3x+1)[(2x-5)^2-(x-3)^2]=0
=>(3x+1)(2x-5-x+3)(2x-5+x-3)=0
=>(3x+1)(x-2)(3x-8)=0
=>\(x\in\left\{-\dfrac{1}{3};2;\dfrac{8}{3}\right\}\)
c; =>(x+5)(0,75x-3+1,25x)=0
=>(x+5)(2x-3)=0
=>x=3/2 hoặc x=-5
\(\Leftrightarrow x\left(-\dfrac{7}{2}-\dfrac{5}{4}\right)=\dfrac{1}{4}\cdot\dfrac{-4}{3}+\dfrac{1}{6}+\dfrac{3}{4}\)
\(\Leftrightarrow x\cdot\dfrac{-19}{4}=\dfrac{7}{12}\)
hay x=-7/57
\(8,75\times x+1,25\times x=2\)
\(\left(8,75+1,25\right)\times x=2\)
\(10\times x=2\)
\(x=2:10\)
\(x=0,2\)