tim x
1278+x*8=4878
1278 + X x 8 = 4878
1278 + X x 8 = 4878
X x 8 = 4878-1278
X x 8 = 3600
x=450
\(1278+x\times8=4878\)
\(\Rightarrow x\times8=4878-1278\)
\(\Rightarrow x\times8=3600\)
\(\Rightarrow x=3600:8\)
\(\Rightarrow x=450\)
Vậy x = 450
1278 + X x 8 = 4878
=>X x 8 = 4878-1278 =3600
=>X=3600 : 8
=> X = 450
1000+9000+4805+4890+4878+4848+156489+156489=
tim x:(x+1)^2/8=8/x+1
\(\dfrac{\left(x+1\right)^2}{8}=\dfrac{8}{x+1}\\ \Rightarrow\left(x+1\right)^2\left(x+1\right)=8\cdot8\\ \left(x+1\right)^3=64\\ \left(x+1\right)^3=4^3\\ \Rightarrow x+1=4\\ x=3\)
\(\dfrac{\left(x+1\right)^2}{8}=\dfrac{8}{x+1}\)
\(\Leftrightarrow\left(x+1\right)^3=64=4^3\)
\(\Leftrightarrow x+4=1\Rightarrow x=3\)
\(\dfrac{\left(x+1\right)^2}{8}=\dfrac{8}{x+1}\)
=>\(\left(x+1\right)^2\left(x+1\right)=8.8\)
=>\(\left(x+1\right)^3=64\)
=>\(\left(x+1\right)^3=4^3\)
=>\(x+1=4\)
=>\(x=3\)
Tim x biet (X-8)7=(X-8)8
tim x x- [1/4+1/8] bang 5/8
x - (\(\dfrac{1}{4}\) + \(\dfrac{1}{8}\)) = \(\dfrac{5}{8}\)
x - \(\dfrac{3}{8}\) = \(\dfrac{5}{8}\)
\(x\) = \(\dfrac{5}{8}\) + \(\dfrac{3}{8}\)
\(x\) = 1
x-(1/4+1/8)=5/8
x-3/8=5/8
x=5/8+3/8
x=1
Tim x
x+8-2:2=8
x + 8 - 2 : 2 = 8
x + 8 - 1 = 8
x + 8 = 8 + 1
x + 8 = 9
x = 9 - 8
x = 1
x + 8 - 2 : 2 = 8
x + 8 - 1 = 8
x + 8 = 8 + 1
x + 8 = 9
x = 9 - 8
x = 1
x+8-2:2=8
x+8-1 =8
x+8 =8+1
x+8 =9
x =9-8
x 1
De tim so tu nhien x ,biet rang neu lay so do tru di 3 roi chia cho 8 thi dc 12 ,ta co the viet (x-3) :8=12roi tim x , ta duoc x =99.
Bang cach lam nhu tren ,hay tim so tu nhien x,biet rang neu no nhan voi 3 roi tru di 8 ,sau do chia cho 4 thi dc 7
tim 2 so tu nhien x, y biet y/8 - x/8 = 1/8 va x<y
\(\frac{y}{8}-\frac{x}{8}=\frac{1}{8}\)
\(\Rightarrow\)\(y-x=1\)
Có rất nhiều đáp án mà bạn có thể lựa chọn
ta có: y/8 - x/8 = 1/8
=> y - x = 1
đề bài có cho thêm cái gì nữa ko, nếu ko thì có nhiều giá trị lắm.
bai 3 : tim x
6 nhan ( x+9845 ) = 29042 nhan 6
(x chia 3) nhan 8 = 8 nhan 3198
bai 7 : tim x
191+ x + 9 = 43 nhan 5
x nhan 25 nhan 4 = 125 nhan 8
bai 8 : tim x
128 nhan x - 12 nhan x - 16 nhan x = 5208000
x nhan 27 + x nhan 30 + x nhan 43 =210500
Lời giải đầy đủ:
Bài 3:tìm x
A,
6.(x+9845)=29042.6
(x+9845)=29042.6:6
x+9845=29042
x=29042-9845
x=19197.
B,
(x:3).8=8.3198
(x:3)=3198.8:8
x:3=3198
x=3198.3
x=9594.
Bài 7:
A/191+x+9=43.5
200+x=215
x=215-200
x=15.
B/x.25.4=125.8
x.100=1000
x=1000:100
x=10.
Bài 8:
A/ 128.x-12.x-16.x=5208000
(128-12-16).x=5208000
100.x=5208000
x=5208000:100
x=52080.
B/ x.27+x.30+x.43=210500
x.(27+30+43)=210500
x.100=210500
x=210500:100
x=2105.
K mình nhé!