tìm X
A) X+X:0,5+X:0,25+X:0,125=15
B) 150:(X-4x9)=25
X+2x X+3x X+.......+10x X=165
Tìm x:
X:0,125+x:0,5+x:0,25=x:0,5+165
x : 0,125 + x : 0,5 + x : 0,25 = x : 0,5 + 165
x : 8 + x : 2 + x : 4 = x : 2 + 165
x : x : 8 + x : 2 + x : 4 = 2 + 165
1 : 8 + x : 2 + x : 4 = 167
8 + x : [ 2 + 4 ] = 167
8 + x : 6 + 167
x : 6 = 167 - 8
x : 6 = 159
x = 159 : 6
x = 26.5
(x+1)+(x+2)+(x+3)+......+(x+100)=5750
x+x:0,5+x:0,25+x:0,125=150
Giải:
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(100.x+\left(1+2+3+...+100\right)=5750\)
Số số hạng \(\left(1+2+3+...+100\right)\) là: \(\left(100-1\right):1+1=100\)
Tổng dãy \(\left(1+2+3+...+100\right)\) là: \(\left(1+100\right).100:2=5050\)
\(\Rightarrow100.x+5050=5750\)
\(100.x=5750-5050\)
\(100.x=700\)
\(x=700:100\)
\(x=7\)
\(x+x:0,5+x:0,25+x:0,125=150\)
\(x.\left(1+2+4+8\right)=150\)
\(x.15=150\)
\(x=150:15\)
\(x=10\)
Chúc bạn học tốt!
Tìm x
a)x.(5-2x)-2x.(1-x)=15
b)(3x+2)2+(1+3x).(1-3x)=2
a) \(x\left(5-2x\right)-2x\left(1-x\right)=15\\ \Leftrightarrow5x-2x^2-2x+2x^2=15\\ \Leftrightarrow3x=15\\ \Leftrightarrow x=5\)
Vậy x = 5 là nghiệm của pt.
b) \(\left(3x+2\right)^2+\left(1+3x\right)\left(1-3x\right)=2\\ \Leftrightarrow\left(9x^2+12x+4\right)+1-9x^2=2\\ \Leftrightarrow12x+5=2\\ \Leftrightarrow12x=-3\\ \Leftrightarrow x=\dfrac{-1}{4}\)
Vậy \(x=-\dfrac{1}{4}\) là nghiệm của pt.
a)x.(5-2x)-2x.(1-x)=15
x [ 5 - 2x -2.(1-x) ] = 15
x ( 5 - 2x -2 + 2x ) =15
x . 3 =15
x = 5
b)(3x+2)2+(1+3x).(1-3x)=2
9x2+12x+4+1-9x2=2
12x + 5 = 2
12x = -3
x = -1/4
Cứu mink với mn ơiiiiiiiiiiiiiiiii
x+x :0,5 +x :0,25 +x: 0,125 =150
x + x : 0,5 + x : 0,25 + x : 0,125 = 150
\(x\) x 1 + \(x\) x 2 + \(x\) x 4 + \(x\) x 8 = 150
\(x\) x (1 + 2 + 4 + 8) = 150
\(x\) x 15 = 150
\(x\) = 150 : 15
\(x=10.\)
x + x : 0,5 + x : 0,25 + x : 0,125 = 150
X x 1 + X x 2 + X x 4 + X x 8 = 150
X x (1 + 2 + 4 + 8) = 150
X x 15 = 150
+> X = 10
x+x : ( 0,5 + 0, 25 + 0, 125 ) = 150
Mik gợi ý nhé
Tìm X:
X + X : 0,25 + X : 0,5 + X : 0,125 = 0,45
Tìm x
a) 6x(5x + 3) + 3x(1 – 10x) = 7 b) (3x – 3)(5 – 21x) + (7x + 4)(9x – 5) = 44
c) (x + 1)(x + 2)(x + 5) – x2(x + 8) = 27
d) 5x(12x + 7) – 3x(20x – 5) = - 100
e) 0,6x(x – 0,5) – 0,3x(2x + 1,3) = 0,138
a) 6x(5x + 3) + 3x(1 – 10x) = 7
⇒ 30x2+18x+3x-30x2=7
⇒21x=7
⇒x=\(\dfrac{7}{21}\)
⇒x= \(\dfrac{1}{3}\)
b) (3x – 3)(5 – 21x) + (7x + 4)(9x – 5) = 44
⇒15x-63x2-15+63x + 63x2-35x+36x-20=44
⇒79x-35=44
⇒79x=44+35
⇒79x=79
⇒x=1
d) 5x(12x + 7) – 3x(20x – 5) = - 100
⇒60x2+35x-60x2+15=-100
⇒35x+15=-100
⇒35x=-100-15
⇒35x=-115
⇒x=\(\dfrac{-115}{35}\)
⇒x=\(\dfrac{-23}{7}\)
Tìm x,biết:
a)x*96+x:0,25=48,32
b)x:0,25+x+x*95=73,74
c)x:0,5+x:0,25+x+x*93=35,36
d)x:0,125+x+x*91=78,56
a: =>100x=48,32
hay x=0,4832
b: =>4x+x+95x=73,74
=>100x=73,74
hay x=0,7374
c: =>2x+4x+x+93x=35,36
=>100x=35,36
hay x=0,3536
a)Xx96+x:0,25=48,32
Xx96+Xx4 =48,32
X x(96+4) =48,32
Xx 100 =48,32
X =48,32:100
X = 0,4832
b)x:0,25+x+Xx95 =73,74
Xx4 +Xx1+Xx95= 73,74
X x(4+1+95) =73,74
X x 100 =73,74
X =73,74:100
X = 0,7374
c)x:0,5+x:0,25+x+Xx93=35,36
Xx2 + Xx4+Xx1+Xx93=35,36
Xx(2+4+1+93) = 35,36
Xx 100 = 35,36
X =35,36:100
X =0,3536
d)X:0,125+X+Xx91=78,56
Xx 8+Xx1+Xx91=78,56
Xx(8+1+91) =78,56
Xx 100 =78,56
X =78,56:100
X =0,7856
19,8 : 2 x 44,44 x 2x 13,2 : 0,25 / 3,3 x 88,88 :0,5 x 6,6 : 0,125 x 5
Tìm X biết X+X ÷ 0,25 +X ,÷ 0,5 +X ÷ 0,125 =0,45
x+x : 0,25 + x : 0,5 + x : 0,125 = 0,45
x + x .4 + x.2 + x.7 = 0,45
x . ( 1+4+2+8) = 0,45
x.15=0,45
x=0,45 :15
x=0,03