1084 + (942 - 2x) : 36 x 14 = 1434
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1084 +(942 -2x) :36 x44 =1434
=>(942 -2x) :36 x44 =1434 -1084
=>(942 -2x) :36 x44 = 350
=>(942 -2x) :36 =350 :44
=>(942 -2x) :36 =175 /22
=>(942 -2x)=175 /22x 36
=>(942 -2x)= 3150 /11
=>2x = 3150 /11-942
=>2x =-7212 /11
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xin lôi nhưng mink bn rui k ghi dc
Tìm x biết
a) 14x + 27x + 13x = 3888
b) 1084 + ( 942 - 2x ) : 36 .14 = 1434
Giúp mk với các bn.Mk k cho
b) 1084+(942-2x):16.14=1434
=>(942-2x):36.14=1434-1084
=>(942-2x):36.14=350
=>(942-2x):36=350:14
=>(942-2x):36=25
=>942-2x=25.36
=>942-2x=900
=>2x=942-900
=>2x=42
=>x=42:2
=>x=21
a) 14x+27x+13x=3888
=>(14+27+13)x=3888
=>54x=3888
=>x=3888:54
=>x=72
\(942\times112-942\times11-942\)
\(=942\times\left(112-11-1\right)\)
\(=942\times100\)
\(=94200\)
\(\dfrac{1}{3}\times\dfrac{14}{15}+\dfrac{14}{15}\times\dfrac{2}{3}\)
\(=\dfrac{14}{15}\times\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)
\(=\dfrac{14}{15}\times\left(\dfrac{1+2}{3}\right)\)
\(=\dfrac{14}{15}\times\dfrac{3}{3}\)
\(=\dfrac{14}{15}\times1\)
\(=\dfrac{14}{15}\)
942 \(\times\) 112 - 942 \(\times\) 11 - 942
= 942 \(\times\) 112 - 942 \(\times\) 11 - 942 \(\times\) 1
= 942 \(\times\) ( 112 - 11 - 1)
= 942 \(\times\) 100
= 94200
1) \(2x\left(x-3\right)+5x-15=0\)
\(2x\left(x-3\right)+5\left(x-3\right)=0\)
\(\left(x-3\right)\left(2x+5\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x-3=0\\2x+5=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=\dfrac{-5}{2}\end{matrix}\right.\)
2) \(x\left(2x-7\right)-4x+14=0\)
\(x\left(2x-7\right)-2\left(2x-7\right)=0\)
\(\left(2x-7\right)\left(x-2\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}2x-7=0\\x-2=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{7}{2}\\x=2\end{matrix}\right.\)
3) \(x^2-12x+36=0\)
\(\left(x-6\right)^2=0\)
\(x-6=0\)
\(x=6\)
4) \(\left(x+3\right)\left(x^2-3x+9\right)-x\left(x-1\right)\left(x+1\right)-27=0\)
\(\left(x^3+3^3\right)-x\left(x^2-1\right)-27=0\)
\(x^3+27-x^3+x-27=0\)
\(x=0\)
a) 5 + 45(2x - 1) = 10
45(2x - 1) = 10 - 5
45(2x - 1) = 5
2x - 1 = 5 : 45
2x - 1 = 1/9
2x = 1/9 + 1
2x = 10/9
x = 10/9 : 2
x = 5/9
b) 54 : (2ˣ⁻³ + 1) + 3 = 9
54 : (2ˣ⁻³ + 1) = 9 - 3
54 : (2ˣ⁻³ + 1) = 6
2ˣ⁻³ + 1 = 54 : 6
2ˣ⁻³ + 1 = 9
2ˣ⁻³ = 9 - 1
2ˣ⁻³ = 8
2ˣ⁻³ = 2³
x - 3 = 3
x = 3 + 3
x = 6
c) 14 + 36 : 3ˣ⁻⁵ = 18
36 : 3ˣ⁻⁵ = 18 - 14
36 : 3ˣ⁻⁵ = 4
3ˣ⁻⁵ = 36 : 4
3ˣ⁻⁵ = 9
3ˣ⁻⁵ = 3²
x - 5 = 2
x = 2 + 5
x = 7
a: =>45(2x-1)=5
=>2x-1=1/9
=>2x=10/9
=>x=5/9
b: =>\(\dfrac{54}{2^{x-3}+1}=6\)
=>\(2^{x-3}+1=9\)
=>\(2^{x-3}=8\)
=>x-3=3
=>x=6
c: \(14+36:3^{x-5}=18\)
=>\(\dfrac{36}{3^{x-5}}=18-14=4\)
=>\(3^{x-5}=9\)
=>x-5=2
=>x=7