a) \(\frac{4}{5}\)x \(\frac{3}{x}\)x \(\frac{2}{11}\)= \(\frac{24}{156}\) b)\(\frac{4}{3}\) :\(\frac{x}{5}\) =\(\frac{5}{13}\) x \(\frac{4}{9}\)
tìm x hộ mình với ai dùng và nhanh mình sẽ tích cho
\(a.\frac{4}{5}x\frac{3}{x}x\frac{2}{11}=\frac{24}{165}\)
\(b.\frac{4}{3}:\frac{x}{5}=\frac{5}{13}x\frac{4}{9}\)
\(a.\frac{4}{5}\times\frac{3}{x}\times\frac{2}{11}=\frac{24}{165}\)
\(\frac{3}{x}=\frac{24}{165}:\frac{4}{5}:\frac{2}{11}\)
\(\frac{3}{x}=1\)
\(\Rightarrow x=3\)
\(b.\frac{4}{3}:\frac{x}{5}=\frac{5}{13}\times\frac{4}{9}\)
\(\frac{4}{3}\times\frac{5}{x}=\frac{20}{117}\)
\(\frac{5}{x}=\frac{20}{117}:\frac{4}{3}\)
\(\frac{5}{x}=\frac{5}{39}\)
\(\Rightarrow x=39\)
Đúng nha
Tính nhanh:
a)A=(\(19\frac{5}{8}\): \(\frac{7}{12}\)-13\(\frac{1}{4}\):\(\frac{7}{2}\))x\(\frac{4}{5}\)
b)B=(\(9\frac{30303}{80808}+7\frac{303030}{808080}\))+4.03
Tìm x:
\(5\frac{18}{17}:x+\left(-\frac{4}{7}\right):x+3\frac{1}{7}:17\frac{1}{3}=\frac{4}{11}\)
Mấy bạn ơi cố giúp mik nha ai xong đầu mik tích hộ cho
a) \(-\frac{2}{5}+\frac{2}{3}.x+\frac{1}{6}.x=-\frac{4}{5}\)
b)\(\frac{3}{2}.x-\frac{2}{5}-\frac{2}{3}.x=-\frac{4}{15}\)
c)\(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
Giải giúp mình với, được câu nào thì làm câu nấy ạ! Mình cần gấp
a)\(-\frac{2}{5}+\frac{2}{3}x+\frac{1}{6}x=-\frac{4}{5}\Leftrightarrow\frac{5}{6}x=-\frac{2}{5}\Leftrightarrow x=-\frac{12}{25}\)
Vậy nghiệm là x = -12/25
b)\(\frac{3}{2}x-\frac{2}{5}-\frac{2}{3}x=-\frac{4}{15}\Leftrightarrow\frac{5}{6}x=\frac{2}{15}\Leftrightarrow x=\frac{4}{25}\)
Vậy nghiệm là x = 4/25
c)\(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)\(\Leftrightarrow\left(x+1\right)\left(\frac{1}{10}+\frac{1}{11}+\frac{1}{12}-\frac{1}{13}-\frac{1}{14}\right)=0\)
\(\Leftrightarrow x+1=0\left(\frac{1}{10}+\frac{1}{11}+\frac{1}{12}-\frac{1}{13}-\frac{1}{14}\ne0\right)\)\(\Leftrightarrow x=-1\)
Vậy nghiệm là x = -1
Cảm ơn bạnh nha. Chúc bạn buổi tối ấm =)))) <3
Đúng ghi Đ, sai ghi S vào chỗ chấm:
a) \(\frac{3}{7}+\frac{1}{3}x\frac{3}{7}=\frac{16}{21}x\frac{3}{7}=\frac{16}{49}\) ......
b)\(\frac{5}{9}+\frac{1}{5}x\frac{5}{6}=\frac{5}{9}x\frac{1}{6}=\frac{13}{18}\) ......
c)\(\frac{13}{9}-\frac{7}{9}:\frac{2}{3}=\frac{6}{9}:\frac{3}{2}=1\) ......
d)\(\frac{11}{8}-\frac{5}{8}:\frac{3}{4}=\frac{11}{8}-\frac{5}{8}x\frac{4}{3}=\frac{11}{8}-\frac{10}{24}=\frac{23}{24}\) ......
Mai Hồng Ngọc? Vũ Thị Thu Hằng? Ai đúng dzậy -_-*
BÀI 2 : TÌM X BIẾT :
a,\(\left(\frac{2}{3}\cdot x-\frac{4}{9}\right)\cdot\left(\frac{1}{2}+\frac{-3}{7}:x\right)=0\)
b,\(\frac{x+2}{327}+\frac{x+3}{326}+\frac{x+4}{325}+\frac{x+5}{324}+\frac{x+349}{5}=0\)
LÀM NHANH NHÉ MÌNH CẦN GẤP LẮM LÀM NHANH SẼ LIKE CHO
a) \(\left(\frac{2}{3}x-\frac{4}{9}\right)\left(\frac{1}{2}-\frac{3}{7}:x\right)=0\)
\(\Rightarrow\orbr{\begin{cases}\frac{2}{3}x-\frac{4}{9}=0\\\frac{1}{2}-\frac{3}{7}:x=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{2}{3}\\x=\frac{6}{7}\end{cases}}\)
Vậy \(x\in\left\{\frac{2}{3};\frac{6}{7}\right\}\)
b)
\(\frac{x+2}{327}+\frac{x+3}{326}+\frac{x+4}{325}+\frac{x+5}{324}+\frac{x+349}{5}=0\)
\(\frac{x+2}{327}+1+\frac{x+3}{326}+1+\frac{x+4}{325}+1+\frac{x+5}{324}+1+\frac{x+329}{5}+4=4\)
\(\frac{x+329}{327}+\frac{x+329}{326}+\frac{x+329}{325}+\frac{x+329}{324}+\frac{x+329}{5}=0\)
\(\left(x+329\right)\left(\frac{1}{327}+\frac{1}{326}+\frac{1}{325}+\frac{1}{324}+\frac{1}{5}\right)=0\)
Mà \(\frac{1}{327}+\frac{1}{326}+\frac{1}{325}+\frac{1}{324}+\frac{1}{5}\ne0\)
\(\Rightarrow x+329=0\)
\(\Rightarrow x=-329\)
Vậy \(x=-329\)
\(\frac{4}{9}:\frac{-1}{7}+6\frac{5}{9}.\frac{2}{3}\)
\(\left(\frac{-1}{3}\right)^4.\frac{4}{11}+\frac{7}{11}.\left(\frac{-1}{3}\right)^2\)
\(\left(\frac{-1}{7}\right)^0-2\frac{4}{9}:\left(\frac{2}{3}\right)^2\)
\(\left(\frac{1}{3}-\frac{5}{6}\right)^2+\frac{5}{6}:2\)
Tìm x
\(\left(\frac{3}{5}-\frac{1}{2}x\right)^2+8=12\)
\(\frac{7}{12}-\left|\frac{1}{3}-\frac{1}{2}x\right|=\frac{1}{3}\)
\(\frac{13}{12}-\frac{1}{3}.\left|\frac{1}{5}-\frac{1}{3}x\right|=\frac{1}{2}\)
Nhanh hộ mình nha
Cảm ơn mn
3. Xác định x thỏa mãn:
a) (x-(3/5).(x+2/7)>0
b) (x+(3/2).(x-(3/2)<0
c) (2x-(1/2).(3x-(1/3)<0
d) (5x-(1/2) : ( 1,25 - 3x)
4. Tìm x thuộc Z để : \(\frac{x-5}{9-x}\)là số hữu tỉ dương.
5.Tìm các số nguyên x, y biết :
a) \(\frac{1}{x}-\frac{y}{6}=\frac{1}{3}\)
b) \(\frac{x}{2}+\frac{3}{y}=\frac{5}{4}\)
6. Tìm x thuộc Z để các số sau là số nguyên và tính giá trị đó:
a) A=\(\frac{3x-2}{x+3}\)
b)B=\(\frac{3x+9}{x-4}\)
c) C=\(\frac{6x+5}{2x-1}\)
7. Tìm x biết:
a) \(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
b) \(\frac{x+4}{2000}+\frac{x+3}{2001}=\frac{x+2}{2002}+\frac{x+1}{2003}\)
Bạn nào onl giải hộ mình bài nào cũng được miễn là đúng. Mình cần gấp.
bài 1. Tính giái trị các biểu thức là phân số :
a) \(M=\frac{\frac{3}{5}+\frac{3}{7}+\frac{3}{11}}{\frac{4}{5}+\frac{4}{7}-\frac{4}{11}}\)
b)\(N=\left(\frac{3}{10}-\frac{4}{15}-\frac{7}{20}\right).\frac{5}{19}\)
\(\frac{ }{\left(\frac{1}{14}+\frac{1}{7}-\frac{-3}{35}\right).\frac{-4}{3}}\)
c) \(H=x+\frac{0,2-0,375+\frac{5}{11}}{-0,3+\frac{9}{16}-\frac{15}{22}vs,x=\frac{-1}{3}}\)
bài 2 : tìm x biết :
a)\(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
b)\(\frac{x-1}{2009}+\frac{x-2}{2008}=\frac{x-3}{2007}+\frac{x-4}{2006}\)
c)\(\frac{x+2}{327}+\frac{x+3}{326}+\frac{x+4}{325}+\frac{x+5}{324}+\frac{x+349}{5}=0\)
giúp mình với m.n
Bài 1: Tìm x
a. \(x-\frac{5}{12}-\frac{4}{9}=\frac{-13}{18}\)
b. \(2-\left(x+\frac{3}{7}\right)=\frac{9}{-21}\)
c. \(x-\frac{-3}{11}=\frac{6}{22}+\frac{1}{4}\)
d. \(\frac{13}{36}-\frac{5}{18}-x=\frac{-11}{9}\)
e. \(x-\frac{3}{7}:\frac{9}{14}=\frac{-17}{3}\)
f. \(\left(x-\frac{1}{2}\right):\frac{3}{11}=\frac{11}{4}\)
g. \(\left(2x+\frac{3}{8}\right).\frac{7}{4}=-\frac{21}{32}\)
h. \(x-\frac{x}{3}=\frac{3}{57}:\frac{12}{19}\)
Vì dài qua cho nên bài 2 mình để riêng nhé
mik ko chép lại đề, mik làm luôn:
a) x - \(\frac{31}{36}=\frac{-13}{38}\)
x = \(\frac{-13}{18}+\frac{31}{36}\)
\(x=\frac{5}{36}\)
b)\(2-x-\frac{3}{7}=\frac{9}{-21}\)
\(\frac{11}{7}-x=\frac{3}{7}\)
x = \(\frac{11}{7}-\frac{3}{7}\)
x = 8/7
c) x + 3/11 = 23/44
x = 23/44 - 3/11
x = 1/4
d) \(\frac{1}{12}-x=\frac{-11}{9}\)
x = \(\frac{1}{12}+\frac{11}{9}\)
x = 47/36
e) \(x-\frac{2}{3}=\frac{-17}{3}\)
x= -17/3 + 2/3
x = -5
f) \(x-\frac{1}{2}=\frac{11}{4}.\frac{3}{11}\)
x - 1/2 = 3/4
x = 3/4 + 1/2
x = 5/4
g) \(2x+\frac{3}{8}=\frac{-21}{32}.\frac{4}{7}\)
2x + 3/8 = -3 / 8
2x = -3/8 - 3/8
2x = -9/8
x = -9/8.1/2
x = -9/16
h) x - \(\frac{x}{3}=\frac{3}{57}.\frac{19}{12}\)
x - \(\frac{x}{3}=\frac{1}{12}\)
x = \(\frac{1}{12}+\frac{x}{3}\)
x = \(\frac{1+4x}{12}\)
=> 12x = 1+4x
12x - 4x = 1
8x = 1
x = 1/8
a) \(x-\frac{5}{12}-\frac{4}{9}=\frac{-13}{18}\)
\(x-\frac{5}{12}=\frac{-13}{18}+\frac{4}{9}\)
\(x-\frac{5}{12}=\frac{-13}{18}+\frac{8}{18}\)
\(x-\frac{5}{12}=\frac{-5}{18}\)
\(x=\frac{-5}{18}+\frac{5}{12}\)
....