Tìm X:
4xX/1x5+4xX/5x9+4xX/9x13+4xX/13x17=16
(4xX-0,8) :X+14,5=16
( 4 x X - 0.8 ) : X + 14.5 = 16
( 4 x X - 0.8 ) : X = 16 - 14.5
4 x X - 0.8 = 1.5 x X
4 x X - 1.5 x X = 0.8
( 4 - 1.5 ) x X = 0.8
2.5 x X = 0.8
X = 0.8 : 2.5
X = 0.32
6+4xX=38+16
\(6+4\cdot x=38+16\)
\(\Rightarrow6+4\cdot x=54\)
\(\Rightarrow4\cdot x=54-6\)
\(\Rightarrow4\cdot x=48\)
\(\Rightarrow x=\dfrac{48}{4}=12\)
6 + 4 x X = 38 + 16
6 + 4 x X = 54
4 x X = 54 - 6
4 x X = 48
X = 48 : 4
X = 12.
Vậy X = 12.
TÌM X:75%xX+3/4xX+X=30
\(75\%x+\frac{3}{4}x+x=30\)
\(\Leftrightarrow\left(75\%+\frac{3}{4}+1\right)x=30\)
\(\Leftrightarrow\frac{5}{2}x=30\)
\(\Leftrightarrow x=30:\frac{5}{2}\)
\(\Leftrightarrow x=12\)
4xX+X=250
`4xx x+x=250`
`=>x xx (4+1)=250`
`=>x xx 5=250`
`=> x =250:5`
`=>x=50`
4 \(\times\) \(x\) + \(x\) = 250
4 \(\times\) \(x+x\times1\) = 250
\(x\times\) ( 4 + 1) = 250
\(x\times\) 5 = 250
\(x\) = 250 : 5
\(x\) = 50
Tìm X biết : 75%xX+3/4xX+X=30
đổi 75%=3/4.Ta có:
3/4xX+3/4xX+X=30
(3/4+3/4+1)xX=30
5/2 x X=30
X = 30:5/2
X = 12
\(75\%\times x+\frac{3}{4}\times x+x=30\)
\(\frac{3}{4}\times x+\frac{3}{4}\times x+1\times x=30\)
\(\left(\frac{3}{4}+\frac{3}{4}+1\right)\times x=30\)
\(\frac{5}{2}\times x=30\)
\(x=30\div\frac{5}{2}\)
\(x=12\)
giá xăng từ 20 000 đồng lên 21 000 đồng 1 lít . hỏi giá xăng tăng bao nhiêu phần trăm?
Tìm x
1/4xX-(x-4/5)-1/2=2x-6
1/4 . x - (x - 4/5) - 1/2 = 2x - 6
1/4 x - x + 4/5 - 1/2 = 2x - 6
1/4 x - x - 2x = -6 - 4/5 + 1/2
-11/4 x = -63/10
x = -63/10 : (-11/4)
x = 126/55
4xX-X-X=1,07
`4 xx x -x-x=1,07`
`=> 4 xx x - x xx 1 - x xx 1=1,07`
`=> (4-1-1) xx x=1,07`
`=> 2 xx x =1,07`
`=> x=1,07 : 2`
`=>x=0,535`
`4xx x-x-x=107`
`=>x xx (4-1-1)=1,07`
`=> x xx 2=1,07`
`=>x=1,07:2`
`=>x=0,535`
Tìm x biết:
11x(X-6)-4xX=11
\(11\left(x-6\right)-4x=11\)
\(\Rightarrow11x-66-4x=11\)
\(7x=11+66=77\Rightarrow x=11\)
11.(x-6) - 4.x=11 (chương trình thcs nhân là chấm nha)
11x-66-4x=11 (lấy 11 nhân vs x và 6)
7x=11+66 (chuyển vế là dc nha)
7x=77
x=11
11X-66-4X=11
=>7X-66=11
=>7X=77=>X=11
75%xX+3/4xX+X=30
tìm X
0,75 x X + 0,75 x X + X = 30
X x ( 0,75 + 0,75 + 1 ) = 30
X x 2,5 = 30
X = 30 : 2,5
X = 12
75%xX+3/4xX+X=30
<=>3/4xX+3/4xX+X=30
<=>10/4xX=30
<=>10xX=120
<=>X=120/10=12
Vậy X=12