Tìm x biết
a 2/3×x+3/4=3
b. 720:[41—(2×x—5)]=120
c1/3+1/6+1/10+.......+2/x×(x+1)=2016/2018
tìm x, biết
a) x = 1 phần 2 + 3 phần 4
b) x phần 5 = 5 phần 6 - 19 phần 30
c) x = 1 phần 2 - 2 phần 3
d) x phần 3 = 2 phần 3 trừ 1 phần 7
a) \(x=\dfrac{1}{2}+\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{2}{4}+\dfrac{3}{4}\\ \Rightarrow x=\dfrac{5}{4}\)
b) \(\dfrac{x}{5}=\dfrac{1}{2}-\dfrac{2}{3}\)
\(\Rightarrow\dfrac{x}{5}=\dfrac{3}{6}-\dfrac{4}{6}\)
\(\Rightarrow\dfrac{x}{5}=-\dfrac{1}{6}\)
\(\Rightarrow x=-\dfrac{1}{6}.5\)
\(\Rightarrow x=-\dfrac{5}{6}\)
c) \(x=\dfrac{1}{2}-\dfrac{2}{3}\)
\(\Rightarrow x=\dfrac{3}{6}-\dfrac{4}{6}\)
\(\Rightarrow x=-\dfrac{1}{6}\)
d) \(\dfrac{x}{3}=\dfrac{2}{3}-\dfrac{1}{7}\)
\(\Rightarrow\dfrac{x}{3}=\dfrac{14}{21}-\dfrac{3}{21}\)
\(\Rightarrow\dfrac{x}{3}=\dfrac{11}{21}\)
\(\Rightarrow x=\dfrac{11}{21}.3\)
\(\Rightarrow x=\dfrac{33}{21}\)
tìm x
720:[41-(2x-5)]=23.5
x2016=1x
(x-6)3=(x-6)5
3+2x-1=24-[42-(22-1)]
{[(2x+14):22-3]:2}-1=0
10-{[(x:3+17):10+3.24]=5
3x+25=26.22+2.30
x.(x3)2=x5
20162x-2016=1
các bạn cứ làm đi ý nào cũng được
nhưng hãy giúp mình nha
ne ban minh biet cau tra loi nhung lam the nao bam ngoac vuong
1,Tính nhanh
a,3x\(\left(\frac{1}{7}+\frac{1}{3}-\frac{3}{14}\right):\frac{11}{14}\)
b,\(\left(\frac{21}{8}+\frac{1}{2}\right):\frac{5}{6}\)
3,Tìm x,biết
a,\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+......+\frac{2}{x\cdot\left(x+1\right)}=\frac{2016}{2018}\)
b,720:\(720:[41-\left(2\cdot x-5\right)]=120\)
Câu b:
\(\frac{21}{8}:\frac{5}{6}+\frac{1}{2}:\frac{5}{6}\)
= \(\frac{63}{20}+\frac{3}{5}\)
= \(\frac{15}{4}\)
\(\left(\frac{21}{8}+\frac{1}{2}\right):\frac{5}{6}\)
\(\frac{25}{8}:\frac{5}{6}\)
\(\frac{25}{8}.\frac{6}{5}\)
\(\frac{30}{8}\)
Tìm x biết
a)2x(x-5)-x(3+2x)=26
b)(4x^3-6x^2-6x):(-2x)-(3-2x)(x+1)=18
Mong mọi người giúp
\(a,\Rightarrow 2x^2-10x-3x-2x^2=26\\ \Rightarrow -13x=26\\ \Rightarrow x=-2\\ b, \Rightarrow -2x^2+3x+3-3x-3+2x^2-x=18\\ \Rightarrow -x=18\Rightarrow x=-18\)
(17x-26).52016=52018
7x-2x=62+44:11
7x-4.710=3.710
2x+3+2x=144
720:[41-(2x-5)]=40
120+[(999-9x):60].24=480
7x-2x=6 mũ 2 +44:11
5x=36+4
5x=40
x=40:5=8
1,tìm x,y biết
a,(2+x)2+2.(y-3)2 < hoặc = 4
b,(2.x+1)2016+(2.y-5)2018 < hoặc= 0
2,tìm x
35.32.x+1.27=81
Bài 3:
\(\Leftrightarrow3^{2x+6}=3\)
=>2x+6=1
=>2x=-5
hay x=-5/2
Tim x
\(\frac{x+2015}{5}+\frac{x+2016}{4}=\frac{x+2017}{3}+\frac{x+2018}{2}\)
2/ tim x
\(\frac{x+2015}{5}+\frac{x+2016}{6}=\frac{x+2017}{7} +\frac{x+2018}{8}\)
3/ tim x
\(\frac{1}{3}+\frac{1}{6}+\frac{99}{101}+\frac{1}{15}+... +\frac{1}{x\left(2x+1\right)}=\frac{1}{10}\)
\(\frac{x+2015}{5}+\frac{x+2016}{4}=\frac{x+2017}{3}+\frac{x+2018}{2}\)
\(\Leftrightarrow\left(\frac{x+2015}{5}+1\right)+\left(\frac{x+2016}{4}+1\right)=\left(\frac{x+2017}{3}+1\right)+\left(\frac{x+2018}{2}+1\right)\)
\(\Leftrightarrow\frac{x+2020}{5}+\frac{x+2020}{4}-\frac{x+2020}{3}-\frac{x+2020}{2}=0\)
\(\Leftrightarrow\left(x+2020\right)\left(\frac{1}{5}+\frac{1}{4}-\frac{1}{3}-\frac{1}{2}\right)=0\)
\(\Leftrightarrow x+2020=0\)vì \(\frac{1}{5}+\frac{1}{4}+\frac{1}{3}+\frac{1}{2}\ne0\)
\(\Leftrightarrow x=-2020\)
Cảm ơn bạn rất nhiều mình đã hiểu rồi
Chúc bạn học tốt nhé
a) 3/10 x x=2/5 b) 1/8 : x - = 1/2 d) 5/6 : 3/4 1: 2/3
a) 5/6 + 3/4 1 + 2/3
b) 5/6 - 3/4 1 - 2/3
c) 5/6 x 3/4 1x 2/3
3/10 x x=2/5
x = 2/5:3/10
x = 4/3
1/8 : x = 1/2
x = 1/8:1/2
x= 1/4
5/6 : 3/4 = 5/6x4/2= 10/9
1: 2/3= 1/1 x 3/2= 3/2
5/6 + 3/4 = 19/12
1 + 2/3= 1/1+2/3= 5/3
5/6 - 3/4 = 1/12
1 - 2/3= 1/1-2/3= 1/3
5/6 x 3/4= 5/8
1/1x2/3= 2/3