\(\Rightarrow x=\dfrac{12\cdot5}{15}=4\)
Đúng 2
Bình luận (1)
Bài 7: Tỉ lệ thức
Các câu hỏi tương tự
Tìm x:
a) x/6 = 7/4
b) 3/x = 21/17
c) 125x = 25/3
d) -3/x = 15/7
e) 0,1/5 = x//15
f) -4/1,2 = x/-3,6
g) -2,6/12 = x/-42
h) 21/14 = 33/x
i) 1,4/-5 = 2,1/x
k) 0,12/3 = 0,21/x
l) x-2/3 = 4/5
n) x+3/-4 = 5/12
m) 3/ x-1 = 21/16
Tìm x , y , z biết
a)x/y=9/7 ; y,z=7/3 và x-y+z=-15
b)x/y=7/20 ; y/z=5/8 và 2x+5y-2z=100
c)x/12=y/9=z/5 và xyz=20
d)x/5=y/7=z/3 và x mũ 2 + y mũ 2 + z mũ 2=585
1) \(\dfrac{-5}{\dfrac{12}{\left|\dfrac{2}{3}x+\dfrac{1}{2}\right|}}\)= \(\dfrac{\dfrac{-4}{9}}{\dfrac{8}{15}}\)
2) \(\dfrac{\left|3x-5\right|}{-3}\)= \(\dfrac{\dfrac{-5}{6}}{\dfrac{4}{9}}\)
5, Lập cá TLT từ 4 số sau
12; 15; 16; 20
Tính:
a) (-5)^60.30^5/15^5.5^61 b) (-3)^10.15^5/25^3.(-9)^7
c)4^6.9^5+6^9.120/8^4.3^12-6^11 d) 4^2.25^2+32.125/2^3.5^2
Tìm x:
1) dfrac{1,2}{30}dfrac{3x+4}{50}
2) dfrac{x-1}{x-5}dfrac{6}{7}
3) dfrac{x-1}{3}dfrac{x+3}{5}
4) dfrac{3}{7}dfrac{2x+1}{3x+5}
5) dfrac{2x+3}{3x+1}dfrac{3}{4}
6) dfrac{2x+3}{6}dfrac{7x-3}{15}
7) dfrac{6x-5}{-7}dfrac{5x-3}{-5}
8) dfrac{x+1}{x-2}dfrac{3}{4}
9) dfrac{2x-3}{x+1}dfrac{4}{7}
10) dfrac{2x+3}{7}dfrac{4x-1}{15}
11) dfrac{2x+3}{24}dfrac{3x-1}{32}
12) dfrac{2x+4}{7}dfrac{4x-2}{15}
13) dfrac{11x-2}{7x+5}dfrac{11}{8}
14) dfrac{12-7x}{-13}dfrac{4-3x}{-5}
15) dfrac{52}{2x-1...
Đọc tiếp
Tìm x:
1) \(\dfrac{1,2}{30}\)\(=\dfrac{3x+4}{50}\)
2) \(\dfrac{x-1}{x-5}\)\(=\dfrac{6}{7}\)
3) \(\dfrac{x-1}{3}\)\(=\dfrac{x+3}{5}\)
4) \(\dfrac{3}{7}\)\(=\dfrac{2x+1}{3x+5}\)
5) \(\dfrac{2x+3}{3x+1}\)\(=\dfrac{3}{4}\)
6) \(\dfrac{2x+3}{6}\)\(=\dfrac{7x-3}{15}\)
7) \(\dfrac{6x-5}{-7}\)\(=\dfrac{5x-3}{-5}\)
8) \(\dfrac{x+1}{x-2}\)\(=\dfrac{3}{4}\)
9) \(\dfrac{2x-3}{x+1}\)\(=\dfrac{4}{7}\)
10) \(\dfrac{2x+3}{7}\)\(=\dfrac{4x-1}{15}\)
11) \(\dfrac{2x+3}{24}\)\(=\dfrac{3x-1}{32}\)
12) \(\dfrac{2x+4}{7}\)\(=\dfrac{4x-2}{15}\)
13) \(\dfrac{11x-2}{7x+5}\)\(=\dfrac{11}{8}\)
14) \(\dfrac{12-7x}{-13}\)\(=\dfrac{4-3x}{-5}\)
15) \(\dfrac{52}{2x-1}\)\(=\dfrac{13}{30}\)
3/7= 2x+1/ 3x+5
2x+3/7= 4x-1/15
6x-5/-7= 5x-3/-5
12-7x/-13= 4-3x/-5
Mọi người giúp mình với ạ!
Tìm các số x, y, z biết
x/4 = y/12 = z/15 và y - x = 4
Mng giúp em với ạ gấp lắm
5: Tìm x biết a) x/3 =4/12 b) x-1/ x-2=3/5 c) 2x :6=1/4 d) x² +x/2x²+1=1/2