Tính nhanh
a) 32 x 27 +148 x 34 +16 x 94
b) 2017 x 2013 - 2017
4034 x 1006 + 2017
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\(a,2017\times\left(8+2\right)=2017\times10=20170\\ b,=\dfrac{3}{7}\times\left(\dfrac{9}{7}-\dfrac{2}{7}\right)=\dfrac{3}{7}\times1=\dfrac{3}{7}\)
a) 2017 x 34 + 2017 x 65 + 2017
= 2017 x ( 34+65+1)
= 2017 x 100
= 201700
b) 3/5 x 7/9 - 3/5 x 2/9
= 3/5 x ( 7/9- 2/9)
= 3/5 x 5/9
= 1/3
a) 2017 x 34 + 2017 x 65 + 2017
= 2017 x (34 + 65 + 1)
= 2017 x 100
= 201700
b) \(\dfrac{3}{5}\) x \(\dfrac{7}{9}\) - \(\dfrac{3}{5}\) x \(\dfrac{2}{9}\)
= \(\dfrac{3}{5}\) x \(\left(\dfrac{7}{9}-\dfrac{2}{9}\right)\)
= \(\dfrac{3}{5}\) x \(\dfrac{5}{9}\)
= \(\dfrac{1}{3}\)
x³ + 2x = 0
x(x² + 2) = 0
x = 0 hoặc x² + 2 = 0
*) x² + 2 = 0
x² = -2 (vô lí)
Vậy x = 0
--------------------
8x(x - 2017) - 2x + 4034) = 0
8x(x - 2017) - 2(x - 2017) = 0
(x - 2017)(8x - 2) = 0
x - 2017 = 0 hoặc 8x - 2 = 0
*) x - 2017 = 0
x = 2017
*) 8x - 2 = 0
8x = 2
x = 1/4
Vậy x = 1/4; x = 2017
1)x^3+2x=0
<=>x(x^2+2)=0
<=>x^2=-2(vô lý)
2)8x(x-2017)-2x+4034=0
<=>(x-2017)(8x-2)=0
<=>X=2017,x=1/4
2016.x2017 + 2018 = 4034
2016.x2017 = 4034-2018
2016.x2017 = 2016
x2017 = 1
=>x =1
8x(x-2017)-2x+4034=0
\(\Leftrightarrow\)8x(x-2017)-2(x-2017)=0
\(\Leftrightarrow\)(x-2017)(8x-2)=0
\(\Leftrightarrow\left\{{}\begin{matrix}x-2017=0\\8x-2=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=2017\\x=\frac{1}{4}\end{matrix}\right.\)
Vậy x\(\in\left\{2017;\frac{1}{4}\right\}\)
32 x 27 + 148 x 34 + 16 x 94
= ( 32 x 27 + 16 x 94 ) + 74 * 2 * 34
= 32 ( 27 + 47 ) + 74 x 68
= 32 x 74 + 74 x 68
= ( 32 + 68 ) x 74
= 100 * 74
= 7400
\(\frac{2017\cdot2013-2017}{4034\cdot1006+2007}\)
\(=\frac{2017\cdot\left(2013-1\right)}{2017\cdot\left(2012+1\right)}\)
\(=\frac{2012}{2013}\)
a, 32×27+148×34+16×94
=32×27+74×2×34+16×2×47
=32×27+74×68+32×47
=32×(27+47)+74×68
=32×74+74×68
=74×(32+68)
=72×100
=7200
b, 2017×2013-2017 / 4034×1006+2017
=2017×(2013-1) / 2017×2×1006+2017
=2017×2012 / 2017×2012+2017
=1/2017