giúp mik
Rút gọn
1/ -3x(x+2)^2+(x+3)(x-1)(x+1)-(2x-3)^2
rút gọn
1, 1/3 x^2 y^5 ( -3/5 x^3 y ) + x^5 y^6
\(\dfrac{1}{3}x^2y^5\left(\dfrac{-3}{5}x^3y\right)+x^5y^6=\dfrac{-1}{5}x^5y^6+x^5y^6=\dfrac{4}{5}x^5y^6\)
1: Ta có: \(\dfrac{1}{3}x^2y^5\cdot\left(-\dfrac{3}{5}x^3y\right)+x^5y^6\)
\(=\dfrac{-1}{5}x^5y^6+x^5y^6\)
\(=\dfrac{4}{5}x^5y^6\)
Cần giải giúp bài toán này, Nhân Đa Thức vs đơn thức nhé :D Đề : Tìm X
1) (3x+1)(x-2)(2x-3)-(x-1)(x+2)
2)(4x-3)(x+2)(2x-1)-(x-1)(x+2)
3)(3x-2)(x+5)(x-4)-(2x-1)(x+3)
4)(2x-1)(x+2)(x-1)-3x3
5)(x-2)(3x+1)(x+2)-x2
ai giúp mình, mình xin cảm ơn :3
1) 2x – (3 – 5x) = 4( x +3)
2) 5(2x-3) - 4(5x-7) =19 - 2(x+11)
3) 5x - 4(6-x)(x + 3) = (4-2x)(3-2x) + 2
4) (x - 1)3 - (3x + 2)(-12) = (x2 + 1)(x - 2) - x2
5) (3x -1)2 - (x +3)(2x-1) = 7(x + 1)(x -2) -3x
mn giúp mình vs
1) 2x – (3 – 5x) = 4( x +3)
<=>2x-3+5x=4x+12
<=>2x-3+5x-4x-12=0
<=>3x-15=0
<=>x=5
2) 5(2x-3) - 4(5x-7) =19 - 2(x+11)
<=>10x-15-20x+28=19-2x-22
<=>10x-15-20x+28-19+2x+22=0
<=>-8x+16=0
<=>x=2
tham khảo
1) 2x – (3 – 5x) = 4( x +3)
<=>2x-3+5x=4x+12
<=>2x-3+5x-4x-12=0
<=>3x-15=0
<=>x=5
2) 5(2x-3) - 4(5x-7) =19 - 2(x+11)
<=>10x-15-20x+28=19-2x-22
<=>10x-15-20x+28-19+2x+22=0
<=>-8x+16=0
<=>x=2
Câu 1: Giải các phương trình sau:
a) 3x-2(x-3)=0
b) (x+1) (2x-3) = ( 2x -1) (x +5)
c) 2x/ x-1 -x/x+1 =1
d) (2x +3) (3x-5)=0
e) x-2/x+2-3/x-2 = 2(x-11)/ x2
giúp mình với ạ huhu\(^{ }\)
\(a,3x-2\left(x-3\right)=0\\ \Leftrightarrow3x-2x+6=0\\ \Leftrightarrow x=-6\\ b,\left(x+1\right)\left(2x-3\right)=\left(2x-1\right)\left(x+5\right)\\ \Leftrightarrow2x^2+2x-3x-3=2x^2-x+10x-5\\ \Leftrightarrow2x^2-x-3=2x^2+9x-5\\ \Leftrightarrow10x-2=0\\ \Leftrightarrow x=\dfrac{1}{5}\\ c,ĐKXĐ:x\ne\pm1\\ \dfrac{2x}{x-1}-\dfrac{x}{x+1}=1\\ \Leftrightarrow\dfrac{2x\left(x+1\right)}{\left(x+1\right)\left(x-1\right)}-\dfrac{x\left(x-1\right)}{\left(x+1\right)\left(x-1\right)}-\dfrac{\left(x+1\right)\left(x-1\right)}{\left(x+1\right)\left(x-1\right)}=0\\ \Leftrightarrow\dfrac{2x^2+2x-x^2+x-x^2+1}{\left(x+1\right)\left(x-1\right)}=0\)
\(\Rightarrow3x+1=0\\ \Leftrightarrow x=-\dfrac{1}{3}\left(tm\right)\)
\(d,\left(2x+3\right)\left(3x-5\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}2x+3=0\\3x-5=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{3}{2}\\x=\dfrac{5}{3}\end{matrix}\right.\\ e,ĐKXĐ:x\ne\pm2\\ \dfrac{x-2}{x+2}-\dfrac{3}{x-2}=\dfrac{2\left(x-11\right)}{x^2-4}\\ \Leftrightarrow\dfrac{\left(x-2\right)^2}{\left(x-2\right)\left(x+2\right)}-\dfrac{3\left(x+2\right)}{\left(x-2\right)\left(x+2\right)}-\dfrac{2x-22}{\left(x-2\right)\left(x+2\right)}=0\)
\(\Leftrightarrow\dfrac{x^2-4x+4-3x-6-2x+22}{\left(x-2\right)\left(x+2\right)}=0\\ \Rightarrow x^2-9x+20=0\\ \Leftrightarrow\left(x^2-5x\right)-\left(4x-20\right)=0\\ \Leftrightarrow x\left(x-5\right)-4\left(x-5\right)=0\\ \Leftrightarrow\left(x-4\right)\left(x-5\right)\\ \Leftrightarrow\left[{}\begin{matrix}x=4\left(tm\right)\\x=5\left(tm\right)\end{matrix}\right.\)
Các bạn giúp mình với !!!
a,(3x-1)2+(x+3)2-10(x+1)(x-1)=0
b,(x+3)3+(2x+1)(4x2-2x+1)-9x2(x+1)=54
c,(x-3)3-(x-3)(x2+3x+9)+9(x+1)2=-33
Tìm x, biết
1)2x.(5x-3x)+2x.(3x-5)-3(x-7)=3
2) 3x.(x+1)-2x.(x+2)=-1-x
3)2x^2+3(x^2-1)=5x.(x+1)
Mấy cậu giải chi tiết câu này giúp mk đc không!!!^-^
1) 2x.(5x-3x)+2x.(3x-5)-3.(x-7)=3
10x-6x^2+6x^2-10x-3x+21=3
-3x =-18
suy ra x=6
2) 3x.(x+1) -2x.(x+2)=-1-x
3x^2 +3x-2x^2-4x =-1-x
x^2 =-1
suy ra không có giá trị nào của x thỏa mãn đề bài
3) 2x^2 +3.(x^2-1)=5x(x+1)
2x^2 +3x^2-3 =5x^2+5x
-5x =3
x=-3/5
giải rồi đấy
nhớ tích đúng nha :)
a)x^3+2x/x^3+1 + 2x/x^2-x+1 +1/x+1
b)3/2x + 3x-3/2x-1 + 3x-2/2x-4x^2
CÁC BẠN GIẢI NHANH GIÚP VỚI ĐANG CẦN GẤP LẮM !!
giúp mik với !!
Giải các phương trình sau :
a) (x-2)^3 + (3x-1)(3x+1) = (x+1)^3
b) (x+1)(2x-3) = (2x-1)(x+5)
c) (x-1)^3 - x(x+1)^2 = 5x(2-x) - 11(x+2)
d) (x-3)(x+4) - 2(3x-2) = (x-4)^2
e) x(x+3)^2 - 3x = (x+2)^3 + 1
f) (x+1)(x^2 - x + 1) - 2x = x(x+1)(x-1)
Mọi người giúp mình với ạ!
a) (x - 2)3 + (3x - 1)(3x + 1) = (x + 1)3
<=> x3 - 6x2 + 12x - 8 + 9x2 - 1 - x3 - 3x2 - 3x - 1 = 0
<=> 9x - 10 = 0
<=> 9x = 10
<=> x = 10/9
Vậy S = {10/9}
b) (x + 1)(2x - 3) = (2x - 1)(x + 5)
<=> 2x2 - x - 3 - 2x2 - 9x + 5 = 0
<=> -10x + 2 = 0
<=> -10x = -2
<=> x = 1/5
Vậy S = {1/5}
c) (x - 1)3 - x(x + 1)2 = 5x(2 - x) - 11(x + 2)
<=> x3 - 3x2 + 3x - 1 - x3 - 2x2 - x = 10x - 5x2 - 11x - 22
<=> -5x2 + 2x + 5x2 + x + 22 - 1 = 0
<=> 3x = -21
<=> x = -7
Vậy S = {-7}
d) (x - 3)(x + 4) - 2(3x - 2) = (x - 4)2
<=> x2 + x - 12 - 6x + 4 - x2 + 8x - 16 = 0
<=> 3x - 24 = 0
<=> 3x = 24
<=> x = 8
Vậy S = {8}
e) x(x + 3)2 - 3x = (x + 2)3 + 1
<=> x3 + 6x2 + 9x - 3x = x3 + 6x2 + 12x + 8 + 1
<=> x3 + 6x2 + 6x - x3 - 6x2 - 12x = 9
<=> -6x = 9
<=> x = -3/2
Vậy S = {-3/2}
f) (x + 1)(x2 - x + 1) - 2x = x(x + 1)(x- 1)
<=> x3 + 1 - 2x = x3 - x
<=> x3 - 2x - x3 + x = -1
<=> -x = -1
<=> x = 1
Vậy S = {1}
giúp em với
a.(2x+1)(x-3)=5x+4-2*(x-2)*(x+2)
b.3x-(2x+1)^2=4x^2-(2x-1)(x+1)
c(3x-1)/(x-1)-(2x+5)/(x+3)=1-(4/(x^2+2x-3))
d.3/(4x-20)+15/(50-2x^2)=7/6x+30
tìm x:
a) 3x(2x+3)-(2x+5)(3x-2)=8
b) 4x(x-1)-3(x^2-5)-x^2=(x-3)-(x+4)
c) 2(3x-1)(3x-1)-(2x-3)(9x-1)-3=3
d) (3x-1)(2x+7)-(x+1)(6x-5)=(x+2)-(x-5)
giúp mk nhé mk có 5 tài khoản mk sẽ tick hết cho