1 : x - 1 /2 : x + 40 % : x = 18 + 30 % : x
100% x 50% : X +40%: X bằng 18+30%: X
Bài 3. Tìm các số tự nhiên x sao cho:
1) x B(9) và x 40 . 3) x B (18) và 20 60 x .
2) x Ư(30) và x 10 . 4) 30 chia hết cho x và x không nhỏ hơn 15.
a.( x - 1/2 ) * 5/3 = 7/4 - 1/2
b.( x + 4/3 ) * 7/4 = 5 - 7/6
c.x : 2 + x + x : 3 + x : 4 = 25
d.100% : x - 50% : x + 40% : x = 18% + 30%: x
B)
( x + 4/3 ) * 7/4 = 5 - 7/6
( x + 4/3) * 7/4 = 5/1 - 7/6
( x + 4/3) * 7/4 = 30/6 - 7/6
( x + 4/3) * 7/4 = 23/6
( x + 4/3) = 23/6 : 7/4
( x+ 4/3) = 23/6 . 4/7
( x+ 4/3) = 46/21
x = 46/21 - 4/3
x = 46/21 - 28/21
x = 18/21 = 6/7
Tk vs kb hộ mk nha! thank u
may cau khac ko kho lam dau chi co cau d thoi.
(100%-50%+40%):x=18%+30%:x
90%:x=18%+30%:x
18%=90%:x-30%:x
18%=60%:x
X=60%:18%
x=..................................................................................................
xong roi do a cho minh nhe
a)
( x - 1/2) * 5/3 = 7/4 - 1/2
( x - 1/2) * 5/3 = 7/4 - 2/4
( x - 1/2) * 5/3 = 5/4
( x - 1/2) = 5/4 : 5/3
( x - 1/2 ) = 5/4 . 3/5
( x - 1/2 ) = 3/4
x = 3/4 + 1/2
x = 3/4 + 2/4
x = 5/4
Tk + kb hộ mk nha! thanks
tim x va y biet
a)x/18=y/15 va x-y=-30
b)7*x=9*y va 10*x-8*y=68
c)(x1/2)^50 +(y+1/3)^40=o
a)
\(\frac{x}{18}=\frac{y}{15},x-y=-30\)
\(\frac{x}{18}=\frac{y}{15}\)
\(\frac{x}{18}-\frac{y}{15}=0\)
\(-\frac{6y-5x}{90}=0\)
\(6y-5x=0\)
\(x-y=-30\)
\(-\left(y-x-30\right)=0\)
\(y-x-30=0\)
\(\Rightarrow x=-180;y=-150\)
dẫn tui bài y:9-8=15 với
100 % x 50 % : X + 40% : X = 18 + 30% : X
=1x0.5:X+0.4:X = 18+0.3:X
=0.5:X+0.4:X = 18+0.3:X
=(0.5+0.4):X = 18+0.3:X
=0.9:X = 18+0.3:X
18=(0.9-0.3):X
18=0.6:X
X=18:0.6
X=30
tìm x biết :
a> 15-10*(x-1)=5
b> (x+1)+(x+2)+(x+3)=18
c> 17+2*(x+2)=25
d> x:17+26=82-17
e> (117+30)*x=882:2
g> 11*(x:81) =330:10
i> (x+1)+(x+2)+(x+3)+(x+4)+(x+5)=40
a) 10*(x-1)=15-5
10*(x-1)=10
(x-1)=10:10
(x-1)=1
x=1+1
x=2
b) x+1+x+2+x+3=18
3x+6=18
3x=18-6
3x=12
x=12:3
x=4
c) 17+2*(x+2)=25
2*(x+2)=25-17
2*(x+2)=8
x+2=8:2
x+2=4
x=4-2
x=2
d) x:17=82-17+26
x:17=91
x=91*17
x=1547
e) 147*x=441
x=441:147
x=3
g)(x:81)=330:10:11
(x:81)=3
x=3*81
x=243
i)x+1+x+2+x+3+x+4+x+5=40
5x+15=40
5x=40-15
5x=25
x=5
Ủng hộ nha
bạn làm sao ấy đề mink viet khac ma ban vite mot neo
(x^2-1)(x^2-7)(x^2-10)(x^-18)(x^2-30) <0. Tìm x
Tìm x: \(\dfrac{1}{x^2+9x+20}+\dfrac{1}{x^2+11x+30}+\dfrac{1}{x^2+13x+30}=\dfrac{1}{18}\)
tìm x
100%:x -50% : x + 40% : x= 18+ 30% : x
100%x-50%:x+40%:x=18+30%:x
<=>x-x/2+2/5x=18+3/10x
<=>10x2-5x2+4=180x+3
<=>10x2-5x2+4-180x-3
<=>5x2-180x+1=0
Denta=(-180)2-4.5.1=32380
Phương trình có 2 nghiệm phân biệt :
x1=180+căn32380/10;x2=180-căn32380/10