Đề bài: Tìm x
Ta có : \(\frac{3}{x-5}=\frac{-4}{x+2}\)
\(\Rightarrow3\left(x+2\right)=-4\left(x-5\right)\)
\(3x+6=-4x+20\)
\(3x+4x=-6+20\)
\(7x=14\)
\(x=14\div7\)
\(x=2\)
Vậy \(x=2\).
\(\frac{3}{x-5}=\frac{-4}{x+2}\)
\(\Rightarrow3x+6=-4x+20\)
\(\Rightarrow7x=14\)
\(\Rightarrow x=2\)
3/x-5= - 4/x+2
=>3.(x+2)=-( - 4).(x-5)
=> 3x+3.2= - 4x-(-20)
=>3x+6= - 4x+20
=>4x+3x=20-6
=> 7x=14
=>x=14:7
=>x=2
\({3\over x-5}={-4\over x+2} \)
\(3x+6=-4x+20\)
\(=>7x=14=>x=2\)
giup minh 2 cau nay nhe
a 3.(x+5)-8=x+17
b/ 5(x+3)-10=2x-19
giup minh nhe minh bay gio can gap lam mai minh phai nop roi
3/x-5=-4/x+2 gip mik mai mik nop bai r
tim x biet
/ 2x+1/+/x-2/=0
/x+5/=2x-1
/x+1/+/x+2/=/5x-3/
giup mik vs mai mik nop roi
Tim cac so nguyen x,y biet : (x+3)x ( y-5)= 25
Giup mik vs, chieu nay mik nop bai r
Chung to A = 1 x 2 + 2 x 3 + 3 x 4 + ..... + n x [ n + 1 ] = {[n x [ n + 1 ] x [ n + 2 ] }/3 , n > 0
Cac ban nhanh len nhe ngay mai minh phai nop roi . Ai lam nhanh , dung dau tien minh cho 1 tich
tnh bang cach hop li neu co the
1/2*3 +1/3.4 + 1/4*5 + ..... + 1/39*40
giup minh voi nhe mai phai nop rui
1. Tinh Gia Tri Bieu Thuc :
a) ( 120 - 12 x 5 ) : 6
b) 494 - ( 75 + 35 : 5 ) x 2
c) 1/4 + ( 3/4 : 1/2 ) x 5/6
d) ( 360 - 15 x 6 ) : 5
giup mik nhanh nhe
tong S =1^2+2^2+3^2+...+30^2 co phai so chinh phuong khong?
Giup mih nhe Chieu mai nop rui . Thnks truoc ^^
b1:tim x:(x-3)2+(y+5)4=0
b2:tìm a,b,c thuộc z biet:
ab=6,bc=12,ac=8
giai ro ho minh nhe,minh can rat gap ,mai phai nop roi
