a) x -2143=1341

x              = 1341 + 2143

x               = 3484

b) x-2146=4146

x             = 4146+2146

x             =6292

c) x+528 = 1322 + 249

x     + 528=1571

x              =1571-528

x             =1043

d) x -3145=3915

x             =3915+3145

x                =7060

X-2143=1341

= 1341+2143

=3484.

X-2146=4146

=4146+2146

= 6292

X+528=1322+249

=1322+249

=1571-528

= 1043

X-3145=3915

=3915 +3145

= 7060.

\(\dfrac{x^3+y^3}{6}=\dfrac{x^3-2y^3}{4}\\ \Rightarrow4x^3+4y^3=6x^3-12y^3\\ \Rightarrow2x^3=16y^3\\ \Rightarrow x^3=8y^3\\ \Rightarrow x=2y\)

Mà \(x^6\cdot y^6=64\Rightarrow\left(2y\right)^6\cdot y^6=64\Rightarrow64\cdot y^{12}=64\)

\(\Rightarrow y^{12}=1\Rightarrow\left[{}\begin{matrix}y=1\Rightarrow x=2\\y=-1\Rightarrow x=-2\end{matrix}\right.\)

Vậy \(\left(x;y\right)=\left(2;1\right);\left(-2;-1\right)\)

\(\left|2x-3\right|=3-2x\)

\(ĐK:x\le\dfrac{3}{2}\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-3=3-2x\\3-2x=3-2x\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{3}{2}\\0=0\left(đúng\right)\end{matrix}\right.\)

Vậy \(S=\left\{x\in R;x=\dfrac{3}{2}\right\}\)

a ) 0.8 x 0.04 x 1.25 x 25 x 0.6524 x 0.3467

= ( 0.8 x 1.25 ) x ( 0.04 x 25 ) x 0.6524 x 0.3467

= 1 x 1 x 0.6524 x 0.3467

= 0.6524 x 0.3476

Vậy ta được phép tính thu gọn là 

0.6524 x 0.3476

b ) 10 x 125 x 4 x 25 x 8

= 10 x (125 x 8) x (4 x 25)

= 10 x 1000 x 100 

= (10x 100) x 1000

= 1000 x 1000

= 1000²

Vậy phét tính thu gọn là 1000²

0,8x0,04 x1,25 x 25 x 0, 6524 x 0,3476 

= ( 0,8x1,25) x ( 0,04 x 25) x ( 0,6524 x 0,3476) 

= 1x10 x 0,22677424

= 2,2677424

10x125 x 4 x 25 x 8 

= 10 x ( 125 x8 ) x ( 4 x 25 ) 

= 10 x1000 x100 

= 1000000

k minh nha 

1000²

từ  đó =>x=5/3 và y=-3/5

=> 3x-5=0 =>x=5/3  tương tự ta cũng tim được y=-3/5

thank bn nhiều nha, mik tick cho bn rồi đó

a) \(\left|\dfrac{2}{7}\right|\) = \(\dfrac{2}{7}\)

b) \(\left|\dfrac{-5}{6}\right|\) = \(\dfrac{5}{6}\)

c) \(\left|4\dfrac{2}{3}\right|\) = \(4\dfrac{2}{3}\)

d) \(\left|-3,41\right|\) = \(3,41\)

a) \(\left|x\right|=\dfrac{2}{7}\)

b) \(\left|x\right|=\dfrac{5}{6}\)

c) \(\left|x\right|=4\dfrac{2}{3}\)

d) \(\left|x\right|=3.41\)

\(3x+2.\left(x-3\right)-x=2010\)

\(\Leftrightarrow3x+2x-6-x=2010\)

\(\Leftrightarrow4x-6=2010\)

\(\Leftrightarrow4x=2016\)

\(\Leftrightarrow x=504\)

Vậy...

\(3\times+2\left(\times-3\right)-\times=2010\)

\(\Rightarrow2\times+2\times-6=2010\)

\(\Rightarrow4\times-6=2010\)

\(\Rightarrow4\times=2016\)

\(\Rightarrow\times=504\)

sợ đáp án sai quá mn