\(\dfrac{-3}{8}-\dfrac{1}{8}\) \(:\) \(x\) \(=-5\dfrac{1}{4}-2\dfrac{1}{4}\)
\(\dfrac{-3}{8}-\dfrac{1}{8}\) \(:\) \(x\)\(=\)\(\dfrac{-15}{2}\)
\(\rightarrow\) \(\dfrac{1}{8}:x=\dfrac{-3}{8}-\dfrac{-15}{2}\)
\(\rightarrow\dfrac{1}{8}:x=\dfrac{57}{8}\)
\(\rightarrow\) \(x=\dfrac{57}{8}:\dfrac{1}{8}\)
\(\rightarrow\) \(x=\dfrac{57}{1}\)
\(V\text{ậy}\) \(x=57\)
Tìm x biết;
\(\dfrac{-3}{8}-\dfrac{1}{8}:x=-5\dfrac{1}{4}-2\dfrac{1}{4}\)
b)(1\(\dfrac{1}{3}-25\%-\dfrac{5}{12}\))-2x=1,6\(:\dfrac{3}{5}\)
Tìm x, biết :
a) \(\left(\dfrac{31}{20}-\dfrac{26}{45}\right).\dfrac{-36}{35}< x< \left(\dfrac{51}{56}+\dfrac{8}{21}+\dfrac{1}{3}\right).\dfrac{8}{13}\)
b) \(\dfrac{-3}{5}.x=\dfrac{1}{4}+0,75\)
c) \(\left(\dfrac{1}{7}-\dfrac{1}{3}\right).x=\dfrac{28}{3}.\left(\dfrac{1}{4}-\dfrac{1}{7}\right)\)
d) \(\dfrac{5}{7}.x=\dfrac{9}{8}-0,125\)
e)\(\left(\dfrac{2}{11}+\dfrac{1}{3}\right).x=\left(\dfrac{1}{7}-\dfrac{1}{8}\right).56\)
Tìm x biết :
1/\(\dfrac{4}{3}\) + x = \(\dfrac{2}{15}\) 2/\(\dfrac{1}{3}+\dfrac{1}{2}:\) x = -0,25 3/(\(\dfrac{2x}{5}+2\) ):(-4) = -1\(\dfrac{1}{2}\) 4/ x.( x + 1) = 0 5/3\(\dfrac{1}{2}-\dfrac{1}{2}x\) = \(\dfrac{2}{3}\)
6/1\(\dfrac{1}{2}+x=\dfrac{3}{2}-7\) 7/\(2x-16=40+x\) 8/\(x:\dfrac{5}{3}+\dfrac{1}{3}=\dfrac{-2}{5}\) 9/\(\dfrac{x}{4}=\dfrac{9}{x}\)
Làm đúng nhận tick!
1. Tính hợp lý giá trị các biểu thức sau:
A= \(49\dfrac{8}{23}\)\(-\left(5\dfrac{7}{32}+14\dfrac{8}{23}\right)\)
B= \(6\dfrac{3}{8}+5\dfrac{1}{2}\)
C= \(8\dfrac{2}{7}-\left(3\dfrac{4}{9}+4\dfrac{2}{7}\right)\)
2. Tìm x, biết
a) \(\left(\dfrac{3x}{7}+1\right):\left(-4\right)=\dfrac{-1}{28}\)
b) \(x:4\dfrac{1}{3}=-2,5\)
c) \(x:\dfrac{-3}{5}=\dfrac{-10}{21}\)
d) \(\dfrac{2}{3}.x-\dfrac{1}{2}=\dfrac{1}{10}\)
e) \(\dfrac{1}{2}.x+\dfrac{1}{2}=\dfrac{5}{2}\)
g) \(\dfrac{-2}{3}-\dfrac{1}{3}.\left(2.x-5\right)=\dfrac{3}{2}\)
h) \(\dfrac{2}{5}.x+\dfrac{1}{2}=\dfrac{-3}{4}\)
i) \(\left(2.x-2\dfrac{4}{5}\right):3\dfrac{1}{8}=1\dfrac{3}{5}\)
k) \(3,2x-\left(\dfrac{4}{5}+\dfrac{2}{3}\right):3\dfrac{2}{3}=\dfrac{7}{20}\)
j) \(\dfrac{2}{3}.x-\dfrac{3}{7}.\left(1-x\right)=\dfrac{20}{7}\)
Làm đúng nhận tick như đã nói! Hãy thể hiện trí thông minh và yêu thích bộ môn toán của mình
BT3: Tìm x, biết
13) \(\left(-1\dfrac{1}{5}+x\right):\left(-3\dfrac{3}{5}\right)=\dfrac{-7}{4}+\dfrac{1}{4}:\dfrac{1}{8}\)
14) \(\dfrac{11}{13}-\left(\dfrac{5}{42}-x\right)=-\left(\dfrac{15}{28}-\dfrac{11}{13}\right)\)
Tìm x \(\in\) Z biết;
a) \(\dfrac{x}{15}=\dfrac{4}{y}=\dfrac{-2}{5}\)
b) \(\dfrac{x-3}{4}=\dfrac{15}{20}\)
c) \(\dfrac{-5}{9}+\dfrac{-8}{15}+\dfrac{22}{-9}+\dfrac{-7}{15}< x\le\dfrac{-1}{3}+\dfrac{-1}{4}+\dfrac{-5}{12}\)
tìm x:
a)\(\left(x+\dfrac{1}{2}\right).\left(\dfrac{2}{3}-2x\right)=0\)
b) \(\left(x.6\dfrac{2}{7}+\dfrac{3}{7}\right).2\dfrac{1}{5}-\dfrac{3}{7}=-2\)
c) \(x.3\dfrac{1}{4}+\left(\dfrac{-7}{6}\right).x-1\dfrac{2}{3}=\dfrac{5}{12}\)
d) \(5\dfrac{8}{17}:x+\left(-\dfrac{4}{17}\right):x+3\dfrac{1}{7}:17\dfrac{1}{3}=\dfrac{4}{11}\)
tìm x
a,\(\dfrac{2}{3}x-\dfrac{5}{6}=1\dfrac{1}{4}\)
b,\(2\dfrac{1}{3}-\dfrac{4}{5}\div x=0,2\)
c,\(\dfrac{5}{6}-\dfrac{2}{3}x=0,2-1\dfrac{1}{4}x\)
d,\(\left(\dfrac{4}{3}-\dfrac{1}{4}x\right)^3=\dfrac{-8}{27}\)
giúp mình nhé mình đang cần gấp
\(a,-\dfrac{2}{3}.\left(x-\dfrac{1}{4}\right)=\dfrac{1}{3}.\left(2x-1\right)\)
\(b,\dfrac{1}{5}.2^x+\dfrac{1}{3}.2^{x+11}=\dfrac{1}{5}.2^7+\dfrac{1}{3}.2^8\)
\(c,\dfrac{x-19}{345}+\dfrac{x-20}{346}=\dfrac{x-1}{347}+\dfrac{x-22}{348}\)
