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x+ 2 + x+ 4 + x +6 + x + 8 + x + 10 + x + 12 = 192
6x + 2+ 4 + 6 + 8 + 10 + 12 = 192
6x+ 42 = 192
6x= 192 - 42
6x= 150
x = 150 : 6
x= 25
x+2+x+4+x+6+x+8+x+10+x+12= 192
<=> 6x + 42 = 192
<=> 6x = 150
<=> x = 25
\(1-x=\frac{29}{12}+\frac{32}{8}\)
\(\Rightarrow1-x=\frac{77}{12}\)
\(\Rightarrow x=1-\frac{77}{12}=\frac{-65}{12}\)
\(\frac{31}{8}.x-\frac{11}{4}=\frac{42}{12}.\frac{10}{8}-\frac{1}{3}\)
\(\Rightarrow\frac{31}{8}.x-\frac{11}{4}=\frac{35}{8}-\frac{1}{3}\)
\(\Rightarrow\frac{31}{8}.x-\frac{11}{4}=\frac{97}{24}\)
\(\Rightarrow\frac{31}{8}.x=\frac{97}{24}+\frac{11}{4}=\frac{163}{24}\)
\(\Rightarrow x=\frac{163}{24}:\frac{31}{8}=\frac{163}{93}\)
1/2* x+2/3=9/2
1/2 * x = 9/2 - 2/3
1/2 * x= 23/6
x= 23/6 : 1/2
x= 23/6 x 2= 23/3
___
1/2*x-1/3=2/3
1/2*x = 2/3 + 1/3
1/2 * x= 1
x= 1: 1/2
x= 2
____
1/4+3/4:x=3
3/4 : x = 3 - 1/4
3/4 : x= 11/4
x= 11/4 : 3/4
x= 11/3
\(\dfrac{1}{2}\)\(\times\)\(x\) + \(\dfrac{2}{3}\) = \(\dfrac{9}{2}\)
\(\dfrac{1}{2}\)\(\times\)\(x\) = \(\dfrac{9}{2}\) - \(\dfrac{2}{3}\)
\(\dfrac{1}{2}\)\(\times\)\(x\) = \(\dfrac{23}{6}\)
\(x\) = \(\dfrac{23}{6}\):\(\dfrac{1}{2}\)
\(x\) = \(\dfrac{23}{3}\)
\(\dfrac{1}{2}\)\(\times\)\(x\) - \(\dfrac{1}{3}\) = \(\dfrac{2}{3}\)
\(\dfrac{1}{2}\)\(\times\)\(x\) = \(\dfrac{2}{3}\) + \(\dfrac{1}{3}\)
\(\dfrac{1}{2}\times\)\(x\) = 1
\(x\) = 1 : \(\dfrac{1}{2}\)
\(x\) = 2
\(\dfrac{1}{4}\) + \(\dfrac{3}{4}\): \(x\) = 3
\(\dfrac{3}{4}\): \(x\) = 3 - \(\dfrac{1}{4}\)
\(\dfrac{3}{4}\):\(x\) = \(\dfrac{11}{4}\)
\(x\) = \(\dfrac{3}{4}\): \(\dfrac{11}{4}\)
\(x\) = \(\dfrac{3}{11}\)
a) 1+2+3+...+2018
=[(2018-1):1+1].(2018+1):2
=2018.2019:2
=2037171
b) 4+7+10+13+...+2017
=[(2017-4):3+1].(2017+4):2
=672.2021:2
=679056
c) 1+2-3-4+5+6-7-8+9+10-11-12+13+14
=(1+2-3-4)+(5+6-7-8)+(9+10-11-12)+13+14
=-4+(-4)+(-4)+13+14
=-12+27
=15
d) 23 x 75 + 25 x 23 + 180
=23 x (75+25) +180
=23 x 100 +180
=2300+180
2480
chúc ban hoc tốt nha
a) Số số hạng: ( 2018 - 1 ) : 1 + 1 = 2018
Tổng: 2018 x ( 2018 + 1 ) : 2 = 2 037 171
`7xx8xx12/6xx21xx16`
`=7xx8xx2xxx21xx16`
`=56xx2xx21xx16`
`=112xx21xx16`
`=2352xx16`
`=37632`
a) x*2+x*3=4
x*(2+3)=4
x*5=4
x=4:5
x=4/5(0,8)
Vậy x = 4/5 (0,8)
b)x*9-1,5=30
x*9 = 30+1,5
x*9 = 31,5
x = 31,5 : 9
x = 3,5
Vậy x = 3,5
a) X x 2 + X x 3 = 4 b) X x 9 - 1,5 = 30
X x ( 2 + 3 ) = 4 X x 9 = 30 + 1,5
X x 5 = 4 X x 9 = 31,5
X = 4 : 5 X = 31,5 : 9
X = 0,8 X = 3,5
~ Hok T ~
\(\dfrac{x}{2}+\dfrac{x+x}{3}+\dfrac{x+x+x}{4}=\dfrac{23}{12}\)
=>\(x\times\left(\dfrac{1}{2}+\dfrac{2}{3}+\dfrac{3}{4}\right)=\dfrac{23}{12}\)
=>\(x\times\dfrac{6+8+9}{12}=\dfrac{23}{12}\)
=>\(x\times\dfrac{23}{12}=\dfrac{23}{12}\)
=>x=1