( 64 - 2.x ) . ( 3.x - 153 ) =0
( 64 - 2.x ) . ( 3.x - 153 ) = 0
2x . 4 = 128
Tìm x thuộc N
( 64 - 2.x ) . ( 3.x - 153 ) = 0
2x . 4 = 128
Tính nhanh
1, 452 x 64 - 552 x 36
2, 324 x 598 - 327 x 198
3, 8350 x 640 x 360 x 350
4, 704 x 135 x 200 - 153 x 4
Ai làm nhanh tick cho :((((((
1.9056
2.129006
3.584146200000
4.19007388
1, 452 x 64 - 552 x 36
=28928-19872=9056
2, 324 x 598 - 327 x 198
=193752-64746=129006
3, 8350 x 640 x 360 x 350
=5344000 x 360 x 350=1923840000 x 350=584146200000
4, 704 x 135 x 200 - 153 x 4
=19008000-153 x 4 = 19007388
1, 452 x 64 - 552 x 36
=28928-19872=9056
2, 324 x 598 - 327 x 198
=193752-64746=129006
3, 8350 x 640 x 360 x 350
=5344000 x 360 x 350=1923840000 x 350=584146200000
4, 704 x 135 x 200 - 153 x 4
=19008000-153 x 4
= 19007388
Tìmx,y biết x^2-25=0 b, (x+1)^2=4 c, (x-3)^3-64=0 d, 2^x+1-128=0 e, x^2 +(y-2)^2=0
a: =>(x-5)(x+5)=0
=>x=5 hoặc x=-5
b: \(\Leftrightarrow\left[{}\begin{matrix}x+1=2\\x+1=-2\end{matrix}\right.\Leftrightarrow x\in\left\{1;-3\right\}\)
c: =>x-3=4
hay x=7
d: =>x+1=7
hay x=6
e: =>x=0 và y-2=0
hay x=0 và y=2
giải hệ pt : \(\left\{{}\begin{matrix}x^3-12z^2+48z-64=0\\y^3-12x^2+48x-64=0\\z^3-12y^2+48y-64=0\end{matrix}\right.\)
tìm x biết
a. x^3-64=0
b. (2x-3)^2-(x+5)^2=0
c.(x^3-x^2)-4x^2+8x-4=0
a/ => x3 = 64 => x3 = 43 => x = 4
b/ => 4x2 - 12x + 9 - x2 - 10x - 25 = 0
=> 3x2 - 22x - 16 = 0
=> (x - 8)(3x + 2) = 0
=> x - 8 = 0 => x = 8
hoặc 3x + 2 = 0 => 3x = -2 => x = -2/3
Vậy x = 8 ; x = -2/3
c/ => x3 - x2 - 4x2 + 8x - 4 = 0
=> x3 - 5x2 + 8x - 4 = 0
=> (x - 2)2 (x - 1) = 0
=> (x - 2)2 = 0 => x - 2 = 0 => x = 2
hoặc x - 1 = 0 => x = 1
Vậy x = 2 ; x = 1
x^3 + (x+4)(x-2)+64=0
x=4x=4 là nghiệm của những phương trình nào dưới đây?
\frac{x^2-6x+8}{x^2-9x+20}=0x2−9x+20x2−6x+8=0 \frac{4x-16+\left(8-2x\right)}{x^2+16}=0x2+164x−16+(8−2x)=0 \frac{x^2-16}{x^3+16}=0x3+16x2−16=0 \frac{x^3-64}{x^2-16}=0x2−16x3−64=09x^2-4-(3x-2)(x+5)=0
x^3+64+(x+4)(2x-3)=0
(x-3)(x^2+4x+9)+2(x^2-9)-10(x-3)=0
9x2 - 4 - ( 3x - 2 )( x + 5 ) = 0
<=> ( 3x - 2 )( 3x + 2 ) - ( 3x - 2 )( x + 5 ) = 0
<=> ( 3x - 2 )( 3x + 2 - x - 5 ) = 0
<=> ( 3x - 2 )( 2x - 3 ) = 0
<=> \(\orbr{\begin{cases}3x-2=0\\2x-3=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=\frac{2}{3}\\x=\frac{3}{2}\end{cases}}\)
x3 + 64 + ( x + 4 )( 2x - 3 ) = 0
<=> ( x + 4 )( x2 - 4x + 16 ) + ( x + 4 )( 2x - 3 ) = 0
<=> ( x + 4 )( x2 - 4x + 16 + 2x - 3 ) = 0
<=> ( x + 4 )( x2 - 2x + 13 ) = 0
<=> \(\orbr{\begin{cases}x+4=0\\x^2-2x+13=0\end{cases}}\Leftrightarrow x=-4\)( vì x2 - 2x + 13 = ( x2 - 2x + 1 ) + 12 = ( x - 1 )2 + 12 ≥ 12 > 0 ∀ x )
( x - 3 )( x2 + 4x + 9 ) + 2( x2 - 9 ) - 10( x - 3 ) = 0
<=> ( x - 3 )( x2 + 4x + 9 ) + 2( x - 3 )( x + 3 ) - 10( x - 3 ) = 0
<=> ( x - 3 )( x2 + 4x + 9 + 2x + 6 - 10 ) = 0
<=> ( x - 3 )( x2 + 6x + 5 ) = 0
<=> ( x - 3 )( x + 1 )( x + 5 ) = 0
<=> x = 3 hoặc x = -1 hoặc x = -5
<=> ( x - 3 )(