12x(3895:5-90)x54
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(4630-x)x54=19980
4630-x=19980:54
4630-x=370
x=4630-370
x=4260
Vậy x=4260
\(\left(4630-x\right)\times54=19980\)
\(\Leftrightarrow4630-x=19980:54\)
\(\Leftrightarrow4630-x=370\)
\(\Leftrightarrow x=4630-370=4260\)
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\(\Leftrightarrow12x^3-108x^2-7x^2+63x-10x+90=0\\ \Leftrightarrow\left(x-9\right)\left(12x^2-7x-10\right)=0\\ \Leftrightarrow\left(x-9\right)\left(12x^2-15x+8x-10\right)=0\\ \Leftrightarrow\left(x-9\right)\left(4x-5\right)\left(3x+2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=9\\x=\dfrac{5}{4}\\x=-\dfrac{2}{3}\end{matrix}\right.\)
\(\Leftrightarrow\left(x-9\right)\left(4x-5\right)\left(3x+2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=9\\x=\dfrac{5}{4}\\x=-\dfrac{2}{3}\end{matrix}\right.\)
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a/ x = 118
b/ x = 134
c/ 54x - 44 = 12457986
=> 54x = 12458030
=> x = 230704,2593
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\(37\left(-29\right)+\left(-37\right)\cdot54-17\cdot37\)
\(=37\left(-29-54-17\right)\)
\(=37\cdot\left(-100\right)=-3700\)
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\(8\times\frac{3333}{2424}\times54\)
\(=8\times\frac{11}{8}\times54\)
\(=11\times54\)
\(=594\)
\(12\times\left(3895:5-90\right)\times54\)
\(=12\times\left(779-90\right)\times54\)
\(=12\times689\times54\)
\(=446472\)
12 x ( 3895 : 5 - 90 ) x 54
= 12 x ( 779 - 90 ) x 54
= 12 x 689 x 54
= 8268 x 54
= 446472