TIM x
101+x*7-6= 101+2*x ( dau * la nhan)
(X-5)^2.(x-5)=-3.9 de bai tim x . Dau ^2 la mu 2 . Dau Cham la dau nhan
Bai1 .tim x : [ x nho la dau nhan , X la so can tim ]
3/5 + 2/7 : X = 1
2,04 : [ X + 6/5 ] =0,2
9,15 x X + 2,85 x X = 48
53,2 : [ X - 3,5 ] + 45,8 = 99
nho trinh bay ai xong truoc tui tik xcho
2/7:x=1-2/7
2/7:x=2/5
x=2/7:2/5
x=5/7
x+6/5=2,04:0,2
x+6/5=51/5
x=51/5-6/5
x=9
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]
tim x thuoc N biet 97.x la so nguyen to ( . la dau nhan)
97x là số nguyên tố
Mà 97x chia hết cho 97 => Hợp số trừ khi x = 1
Vậy x = 1
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
tim x :
A) x . 3,9 + x . 0,1 = 2,7
b) 12,3 : x - 4,5 :x = 15
. la dau nhan nhe( dau cham)
a ) x . 3,9 + x . 0,1 = 2,7
x . ( 3,9 + 0,1 ) = 2,7
x . 4 = 2,7
x = 2,7 / 4
x = 0,675
b) 12,3 / x - 4,5 / x = 15
( 12,3 - 4,5 ) / x = 15
7,8 / x = 15
x = 7,8 / 15
x = 0,52
k m na bn
Chúc bn hc tốt ! * = *
A) x . 3,9 + x . 0,1 = 2,7
x . (3,9 +0,1) = 2,7
x . 4 = 2,7
x = 2,7 :4
x = 0,675
B) 12,3 : x - 4,5 : x - 15
(12,3 - 4,5) : x = 15
7,8 : x = 15
x = 7,8 : 15
x = 0,52
k mình nha
Mình cảm ơn bạn nhiều
Chúc bạn học giỏi
a ) x . 3 , 9 + x . 0 , 1 = 2 , 7
x . ( 3 , 9 + 0 , 1 ) = 2 , 7
x . 4 = 2 , 7
x = 0 , 675
b ) 12 , 3 : x - 4 , 5 : x = 15
( 12 , 3 - 4 , 5 ) : x = 15
7 , 8 : x = 15
x = 0 , 52
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: \(\left(x-1\right)\cdot3x-2\left(x+2\right)-2x=x\left(x-1\right)\)
=>\(3x^2-3x-2x-4-2x=x^2-x\)
=>\(3x^2-7x-4-x^2+x=0\)
=>\(2x^2-6x-4=0\)
=>\(x^2-3x-2=0\)
=>\(x=\dfrac{3\pm\sqrt{17}}{2}\)
2 + x : 7 = 10
chữ x la chữ ích sờ nha cac bn ko phai la dau nhan dau nhe