\(x^3-8x^3+27+7x^3-7x^2+7x-13=0\)
-7x\(^2\)+7x+14=0
-7x\(^2\)-7x+14x+14=0
-7x.(x+1)+14.(x+1)=0
(-7x+14).(x+1)=0
\(\left[{}\begin{matrix}-7x+14=0\Rightarrow-7x=-14\Rightarrow x=2\\x+1=0\Rightarrow x=-1\end{matrix}\right.\)
\(x^3-8x^3+27+7x^3-7x^2+7x-13=0\)
-7x\(^2\)+7x+14=0
-7x\(^2\)-7x+14x+14=0
-7x.(x+1)+14.(x+1)=0
(-7x+14).(x+1)=0
\(\left[{}\begin{matrix}-7x+14=0\Rightarrow-7x=-14\Rightarrow x=2\\x+1=0\Rightarrow x=-1\end{matrix}\right.\)
Tìm x
a,(7x+4)^2-(7x+4)(7x-4)=0
b, 5( x + 3 )( x - 3 ) + ( 2x + 3 )^2+(x-6)^=10
c, (x + 1)^3 + (x – 2)^3 – 2x^2 (x – 1,5) = 3
d,( x + 2)(x^2 – 2x + 4)(x – 2)(x^2 + 2x + 4) = – 65
e, 4x^2 + 4x – 5 = 2
f,16x^2 – 9(x + 1)^2 = 0
Các bạn giúp mình vs mai mình phải nộp rùii
Tìm x biết
1.(x+3)2-(x+2).(x-2)=4x+17
2.(2x+1)2-(4x-1).(x-3)-15=0
3.(2x+3).(x-1)+(2x-3).(1-x)=0
4.2(5x-8)-3(4x-5)=4(3x-4)+11
5.(3x-1).(2x-7)-(1-3x).(6x-5)=0
Rút gọn:
1. (x+3)3- x +2)(x-2)-6x2-20
2. (2x+3)(4x2-6x+9)-(2x-3)(4x2+6x+9)
3. (2x-1)(4x2+2x+1)(2x+1)(4x2-2x+1)
4. (x+4)(x2-4x+16)-(50+x2)
Giúp mình với. Cảm ơn!!!
Phân tích các đa thức sau thành nhân tử.
1) a^2+ab+2b-4 2) x^3-x 3) x^2-6x+8 4) ab+b^2-3a-3b 5) x^3-4x^2-8x+8
6)9x^2+6x-8 7)x^2-y^2-4x+4 8)5x^3-10x^2+5x 9) 3x^2-8x+4 10) 4x^2-4x-3
11) x^2-7x+12 12)x^2-5x-14 13) 3x^2-7x+2 14) a.(x^2+1)-x.(a^2-1) 15) x^4+4
16) (x+2).(x+3).(x+4).(x+5)-24 17) (a+1).(a+3).(a+5).(a+7)+15
Đề bài: Tìm x,y,z biết:
1. | x + 1 | + y mũ 2 + 4y + 4 = 0
2. 4x mũ 2 + 9y mũ 2 + 2 ( 2x - 3y + 1 ) = 0
3. 2x ( x - 1 - y ) + y mũ 2 + 1 = 0
4.x mũ 2 + 5y mũ 2 + 4 ( 1 + y - xy ) = 0
5. | 2x - 1 | + y mũ 2 - y + 1/4 = 0
6. x mũ 2 + y mũ 2 + 4x + 6y + 13 = 0
Các bn giúp mk nhé, mk sẽ tick cho các bn!!!!!!!!!!!!11
Tìm x biết
1. 2(5x-8)-3(4x-5)=4(3x-4)+11
2. (2x+1)2-(4x-1).(x-3)-15=0
3. (3x-1).(2x-7)-(1-3x).(6x-5)=0
CHỨNG MINH :
a/ \(x^2-8x+20>0\forall x\)
b/ \(6x-x^2-19< 0\forall x\)
c/ \(3x^2+y^2-2xy+4x+20>0\forall x,y\)
d/ \(5x^2+10y^2-6xy-4x-2y+3>0\forall x,y\)
AI GIÚP MK VS Ạ AI NHANH MK SẼ VOTE NHA
Tìm x :
1) ( 5x - 1 ) ( x + 1) - 2 ( x - 3 )2 = ( x + 2 ) ( 3x - 1 ) - ( x + 4 )2 + ( x2 - x )
2) ( 3x + 4 ) ( 3x - 4 ) - ( 2x + 5 )2 = ( x - 5 )2 + ( 2x + 1 )2 - ( x2 - 2x ) + ( x - 1 )2
3) ( x - 5 ) ( x + 5 ) - ( x - 2 )3 - 7x2 + ( x + 1 )( x2 - x + 1 ) = ( x + 3 )3 - ( x3 + 9x2 )
4) ( x - 6 )( x2 + 6x + 36 ) - ( x + 4 )3 = ( x - 2 )3 + ( x + 5 )( x2 - 10x + 25 ) - ( 2x3 + 6x2 )
5) ( 2x + 3 )3 - ( 2x + 5 )( 4x2 - 10x + 25 ) = ( 6x - 1 )2 - ( x - 2 )( x2 + 2x + 4 ) + x3
CÁC BẠN GIẢI NHANH CHO MÌNH NHA . BẠN NÀO GIẢI CHI TIẾT NHANH , ĐÚNG MÌNH TICK CHO.
Bài 3. Rút gọn các đa thức sau
a/ (2x-3)(4x^2+6x+9)- (2x+1)(4x^2 - 2x +1)
b/ (x+ 2)(x^2- 2x+4) – (x^3- 2)
c/ (3x+ 5)(9x^2 - 15x +25)- 3x(3x-1)(3x+1)
d/ x^6 - (x^2 + x +1)(x^2 - 1)(x^2 - x+ 1)