a: x/5=32/80
nên x/5=2/5
hay x=2
13/x=26/30
nên 13/x=13/15
hay x=15
-x/7=22/-77
=>x/7=2/7
hay x=2
b: x/9=28/36
=>x/9=7/9
hay x=7
-10/x=50/55
=>-10/x=10/11
hay x=-11
tìm số x biết
a) \(\frac{7}{9}:\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\) b) \(\frac{-2}{3}.x+\frac{1}{5}=\frac{3}{10}\) c) \(\left|x\right|-\frac{3}{4}=\frac{5}{3}\)
\(\frac{29}{30}-\left(\frac{13}{23}+x\right)=\frac{7}{69}\)
tìm x biết
a) \(\frac{62}{7}.x=\frac{29}{9}:\frac{3}{56}\) b) \(\frac{1}{5}:x=\frac{1}{5}-\frac{1}{7}\)
Tìm x,y thuộc Z
a) \(\frac{-5}{x}\) = \(\frac{y}{16}\) =\(\frac{-18}{72}\)
b) \(\frac{x}{3}\) =\(\frac{5}{y}\)
c)\(\frac{x}{y}\) =\(\frac{28}{35}\)
Tìm x biết:
a)\(\frac{-x}{4}\) = \(\frac{-9}{x}\)
b)\(\frac{12}{x+1}\) =\(\frac{5}{30}\)
c)\(\frac{x+42}{5}\) =\(\frac{5x+2}{20}\)
bài 1 : tính
a)\(\frac{-5}{13}-\left(\frac{3}{5}+\frac{3}{13}-\frac{4}{10}\right)\) b) \(\left(\frac{3}{9}-\frac{9}{18}\right)+\frac{3}{6}-\left(\frac{1}{3}-\frac{1}{2}\right)-\frac{5}{15}\) c) \(\frac{9}{18}+\frac{16}{32}-\frac{12}{46}-\frac{9}{17}\) d) \(\left(\frac{14}{18}+\frac{-16}{27}\right)-\left(\frac{2}{3}-\frac{5}{15}\right)\)
Tìm các số nguyên x,y,z biết:
\(\frac{-4}{8}=\frac{x}{-10}\frac{-7}{y}=\frac{z}{-24}\)
+) A = ( 1,11 + 0,19 - 2,6 ) : ( 2,06 + 0,54 ) - ( \(\frac{1}{2}\) + \(\frac{1}{3}\) ) : 2
+) Tìm x :
a, (1,16 - x ) . 2,25 / 10 \(\frac{5}{9}\) - 7\(\frac{1}{4}\) . 2\(\frac{2}{11}\) = 75%
b) x + 25% .x = -1,25
c) x - 75% x = \(\frac{1}{4}\)
+) Tính nhanh nếu có thể :
a) 1\(\frac{1}{2}\) - 3\(\frac{3}{4}\) b) -8\(\frac{1}{6}\) - 7\(\frac{3}{2}\) c) 0,15 - 4,8 + 1,3 d) ( 2\(\frac{1}{3}\) + 3,5 ) : (-4\(\frac{1}{6}\) + 3\(\frac{1}{7}\) ) + 7,5
e) 11\(\frac{1}{4}\) + (2\(\frac{5}{7}\) + 5\(\frac{1}{4}\) ) f) \(\frac{4}{9}\) : ( \(\frac{1}{-7}\) + 6\(\frac{5}{9}\) :(-\(\frac{1}{7}\))
1) Tìm x,y,z biết:
\(\frac{-x}{3}=\frac{6}{-2x}=\frac{y}{-z}\)
2)Tìm 5 số nguyên x biết:
a) \(\frac{1}{3}< \frac{x}{4}< \frac{2}{3}\)
b) \(\frac{3}{5}< \frac{-x}{3}< \frac{4}{5}\)
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