x + 2 . x +3. x + 4. x + ...+...+ 100.x = 5050
dau cha la dau nhan
bai 1:tim x(chu y dau * la dau nhan)
a)(x+1/4)+(3x-4)+2*(x-3)=1
b)2*(x-3)=3(x+2)-x+1
c)x*(x+3)+x(x-2)=2x*(x-1)
d)(x-1)*3x-2*(x+2)-2x=x(x-1)
a: \(\left(x+\dfrac{1}{4}\right)+\left(3x-4\right)+2\left(x-3\right)=1\)
=>\(x+\dfrac{1}{4}+3x-4+2x-6=1\)
=>\(6x-\dfrac{39}{4}=1\)
=>\(6x=1+\dfrac{39}{4}=\dfrac{43}{4}\)
=>\(x=\dfrac{43}{4}:6=\dfrac{43}{24}\)
b: \(2\left(x-3\right)=3\left(x+2\right)-x+1\)
=>\(2x-6=3x+6-x+1\)
=>2x-6=2x+7
=>-6=7(vô lý)
c: \(x\left(x+3\right)+x\left(x-2\right)=2x\left(x-1\right)\)
=>\(x^2+3x+x^2-2x=2x^2-2x\)
=>3x-2x=-2x
=>3x=0
=>x=0
d: \(\left(x-1\right)\cdot3x-2\left(x+2\right)-2x=x\left(x-1\right)\)
=>\(3x^2-3x-2x-4-2x=x^2-x\)
=>\(3x^2-7x-4-x^2+x=0\)
=>\(2x^2-6x-4=0\)
=>\(x^2-3x-2=0\)
=>\(x=\dfrac{3\pm\sqrt{17}}{2}\)
(X-5)^2.(x-5)=-3.9 de bai tim x . Dau ^2 la mu 2 . Dau Cham la dau nhan
tim x , dau cham tuc la dau nhan
5 .x +2 . ( x-3 ) = 36
[3.x-x]:2=x
tim x [dau. hieu la dau nhan]
x +x x 3/4 = 1
chu y chu x thu 3 la dau nhan
tim so tu nhien x biet
(2.x+1)mu 5 /(2.n+1)mu 2=1
2 mũ x+2 .2 mu x+........+10.2 mu x =10 . 11
dau / nay la dau chia
dau . nay la nhan do nhe!!!!
( 2x + 1 )5 : ( 2x + 1 )2 = 1
\(\Rightarrow\)( 2x+ 1 )3 = 1 = 13
\(\Rightarrow\)2x + 1 = 1
\(\Rightarrow\)2x = 0
\(\Rightarrow\)x = 0
2x + 2 . 2x + ... + 10 . 2x= 10 . 11
\(\Rightarrow\)2x . ( 1 + 2 + 3 + ... + 9 + 10 ) = 110
\(\Rightarrow\)2x . 55 = 110
\(\Rightarrow\)2x = 110 : 55
\(\Rightarrow\)2x = 2
\(\Rightarrow\)x = 1
1. 1,2 : (0,4-x) = 2,5
2. x . 3,6 + x . 6,4 = 18,9
3. 9,4 : x + 5,3 : x = 14
Luu Y : dau "." la dau nhan nha.
1: =>0,5:(0,4-x)=2,5
=>0,4-x=0,5/2,5=0,5
=>x=0,4-0,5=-0,1
2: =>x*(3,6+6,4)=18,9
=>10x=18,9
=>x=1,89
3: =>(9,4+5,3):x=14
=>14,7:x=14
=>x=14,7/14=1,05
2 + x : 7 = 10
chữ x la chữ ích sờ nha cac bn ko phai la dau nhan dau nhe
x.2-4=9
(dau . nay la nhan nhe)
2x-4=9
\(\Leftrightarrow\)2x=9+4
\(\Leftrightarrow\)2x=13
\(\Leftrightarrow\)x=\(\frac{13}{2}\)
Vậy: x=\(\frac{13}{2}\)
Câu nào dễ thì cố gắng tự làm nhé bạn.
x . 2 - 4 = 9
x . 2 = 9 + 4
x . 2 = 13
x = 13 : 2
x = \(\frac{13}{2}\)
x =\(6\frac{1}{2}\)
Vì đè bài không nói ĐK x ∈ N hay Z nên x có thể bằng phân số hoặc hỗn số nhé