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=>6x + 1 + 2 + 3 + 4 + 5 + 6 + = 71
=>6x + 21 = 71
6x = 71 - 21 = 50
=>x = 50/6 = 25/3
(x+1)+(x+2)+(x+3)+(x+4)+(x+6)=71
=x*5+1+2+3+4+5+6=71
=x*5+21=71
=x*5=71-21
=x*5=50
=x=50:5
x=10
vậy x=10
(x+x+x+x+x+x+x+x+x) + ( 9-2+7-4+5-6+3-8+1) =95
9x+5=95
9x=95-5
9x=90
x=90:9
x=10
6/x = 4/6 ; 6/x giữ nguyên 4/6 = 2/3 = 6/9 => x= 9
x/72 = 10/16 ; 10/16 = 5/8 = 45/72 => x = 45
x + 1/6 = 2/3 x = 2/3 - 1/6 = 1/2 => x = 1/2
x - 2/12 = 3/4 x = 3/4 + 2/12 = 11/12
Ta có :
(x + 1) + (x + 2) + (x + 3) + (x + 4) + (x + 5) + (x + 6) = 75
=) 6x + ( 1 + .... + 6 ) = 75
=) 6x + [ ( 1 + 6 ) x 6 / 2 ] = 75
=) 6x + 21 = 75
=) 6x = 75 - 21
=) 6x = 54
=) x = 54 : 6
=) x = 9
Mình nhanh nhất nha
x+1+x+2+x+3+x+4+x+5+x+6=75
x.6+(1+2+3+4+5+6)=75
x.6+21=75
x.6=75-21=54
x=54:6=9
\(3\times\left(x-\frac{1}{6}\right)-2\times\left(x-\frac{1}{3}\right)=\frac{2}{3}\)
\(3\times x-3\times\frac{1}{6}-2\times x+2\times\frac{1}{3}=\frac{2}{3}\)
\(3\times x-\frac{1}{2}-2\times x+\frac{2}{3}=\frac{2}{3}\)
\(3\times x-2\times x=\frac{2}{3}+\frac{1}{2}-\frac{2}{3}\)
\(x=\frac{4}{6}+\frac{3}{6}-\frac{4}{6}\)
\(x=\frac{3}{6}\)
\(x=\frac{1}{2}\).
a).(x+x+x+x+...+x)+(1+3+5+....+19)=245
=X*10+100=245
X*10=245-100
X*10=145
x=145:10
x=14,5
mk đi mk tl câu tiếp theo
a, \(x+1+x+3+.....+x+19=245\Rightarrow x+x+x+...+x+1+3+...+19=245\)
\(\Rightarrow10x+\frac{\left(19+1\right)\cdot10}{2}=245\Rightarrow10x+100=245\Rightarrow10x=145\Rightarrow x=14,5\)
b,\(x+2+x+4+...+x+20=155\Rightarrow x+x+...+x+2+4+...+20\)
\(\Rightarrow10x+\frac{\left(20+2\right)\cdot10}{2}=155\Rightarrow10x+110=155\Rightarrow10x=45\Rightarrow x=4,5\)
a x * 4 + [1/2 + 1/4 + 1/8 + 1/6] = 23/16
x * 4 + 25/24 = 23/16
x * 4 = 23/16 - 25/24
x * 4 = 38/96 = 19/48
x = 19/48 / 4
x = 19/172
b x * 1 = 425
x = 425 / 1
x = 425
cau1 x= 1/2 + 3/4
x= 5 / 4
cau2 x = 8 x 1/4
x= 2
cau 3 x= 5/12 - 1/6
x = 1/4
cau 4 x = 4/5 - 1/10
x = 7/10
cau5 x= 2/5 : 1/3
x= 6/5
cau6 x =2/3 : 2/7
x = 7/3
\(x.3+x.6+x.1=1\)
\(x.\left(3+6+1\right)=1\)
\(x.10=1\)
\(x\) \(=\dfrac{1}{10}\)
x . 3 + x . 6 + x = 1
x . 3 + x. 6 + x . 1 = 1
x . ( 3+6+1 ) = 1
x . 10 = 1
x = 1 : 10
x = 0,1