6x1=6
6x2=3
6x3=?
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\(0,36\times740-\dfrac{72}{20}\times4+36\times3\)
\(=0,36\times740-0,36\times10\times4-0,36\times100\times3\)
\(=0,36\times740-0,36\times40+0,36\times300\)
\(=0,36\times\left(740-40+300\right)\)
\(=0,36\times1000\)
\(=360\)
0,36 x 740 - \(\dfrac{72}{20}\) x 4 + 36 x 3
= 3,6 x 74 - 3,6 x 4 + 3,6 x 30
= 3,6 x ( 74 - 4 + 30)
= 3,6 x 100
= 360
\(9x^4+36x^3+29x^2-14x\)
\(=x\left(9x^3+36x^2+29x-14\right)\)
\(=x\left(9x^3+18x^2+18x^2+36x-7x-14\right)\)
\(=x\left[9x^2\left(x+2\right)+18x\left(x+2\right)-7\left(x+2\right)\right]\)
\(=x\left(x+2\right)\left(9x^2+18x-7\right)\)
\(=x\left(x+2\right)\left(9x^2-3x+21x-7\right)\)
\(=x\left(x+2\right)\left[3x\left(3x-1\right)+7\left(3x-1\right)\right]\)
\(=x\left(x+2\right)\left(3x+7\right)\left(3x-1\right)\)
a) Ta có: \(36x^3-4x=0\)
\(\Leftrightarrow4x\left(9x^2-1\right)=0\)
\(\Leftrightarrow x\left(3x-1\right)\left(3x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{1}{3}\\x=\dfrac{-1}{3}\end{matrix}\right.\)
b) Ta có: \(3x\left(x-2\right)+x-2=0\)
\(\Leftrightarrow\left(x-2\right)\left(3x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=\dfrac{-1}{3}\end{matrix}\right.\)
a) \(=6x^2y^2\left(6xy-7\right)\)
b) \(=3xy\left(x^3y+5x-6\right)\)
c) \(=\left(ax+ab\right)-\left(bx+x^2\right)=a\left(b+x\right)-x\left(b+x\right)=\left(a-x\right)\left(b+x\right)\)
d) \(=3\left(2x-1\right)-\left(2x-1\right)^2=\left(2x-1\right)\left(3-2x+1\right)=\left(2x-1\right)\left(4-2x\right)=2\left(2x-1\right)\left(2-x\right)\)
\(a,=6x^2y^2\left(6xy-7\right)\\ b,=3xy\left(x^3y+5x-6\right)\\ c,=x\left(a-x\right)-b\left(a-x\right)=\left(x-b\right)\left(a-x\right)\\ d,=3\left(2x-1\right)-\left(2x-1\right)^2=\left(2x-1\right)\left(3-2x+1\right)=2\left(2-x\right)\left(2x-1\right)\)
x- \(\dfrac{1}{2}\) = 6 x \(\dfrac{1}{24}\)
x- 0,5 = 6 x \(\dfrac{1}{24}\)
x- 0,5 = \(\dfrac{1}{4}\)
x- 0,5 = 0,25
x = 0,25+0,5
x =0,3
x - 1/2 = 6 x 1/24
x - 0,5 = 1/4
x - 0,5 = 0,25
x = 0,25 + 0,5
x = 0,3
\(\frac{1}{3}\times\frac{1}{6}\times\frac{1}{9}=\frac{1\times1\times1}{3\times6\times9}=\frac{1}{162}\)
\(\frac{1}{3}\times\frac{1}{6}:\frac{1}{9}=\frac{1}{3}\times\frac{1}{6}\times\frac{9}{1}=\frac{1\times1\times9}{3\times6\times1}=\frac{9}{18}=\frac{1}{2}\)
Tự tính câu cuối đi
Mình nghĩ 6 x 3 = 2
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6x3=2