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mk ko viết đề nha:
a)=(1/2+1/2)+ (1/3+2/3)+(1/4 +3/4)+(1/5+4/5)
=(2/2 + 3/3) + (4/4 + 5/5)
=2/2 + 4/2
=6/4
À mik lm đc câu a thui nha!Nhưng k cho mik vs nhé!
\(\frac{3}{4}:x=\frac{1}{3}\)
\(x=\frac{3}{4}:\frac{1}{3}\)
\(x=\frac{3}{4}.\frac{3}{1}\)
\(x=\frac{9}{4}\)
Vậy x= \(\frac{9}{4}\)
b, \(x.\frac{4}{11}=22\)
\(x=22:\frac{4}{11}\)
\(x=22.\frac{11}{4}\)
\(x=\frac{121}{2}\)
Vậy \(x=\frac{121}{2}\)
\(\frac{5}{11}\times\frac{5}{22}\times22\times\frac{11}{5}\)
\(=\left(\frac{5}{11}\times\frac{11}{5}\right)\times\left(22\times\frac{5}{22}\right)\)
\(=1\times5\)
\(=5\)
a \(\dfrac{6}{15}+\dfrac{11}{15}=\dfrac{17}{15}\)
b \(\dfrac{22}{77}-\dfrac{14}{77}=\dfrac{8}{77}\)
c \(\dfrac{11}{13}\times\dfrac{26}{31}=11\times\dfrac{2}{31}=\dfrac{22}{31}\)
d \(\dfrac{1}{2}\times3\times\dfrac{2}{5}=\dfrac{3}{5}\)
3/22 x 3/11 x 22=
c1:\(\frac{3\times3\times22}{22\times11}=\frac{9}{11}\) c2:\(\frac{9}{242}\times22=\frac{9}{11}\)
( 1/2 + 1/3 ) x 2/5=
c1:\(\frac{5}{6}\times\frac{2}{5}=\frac{1}{3}\) c2:\(\frac{1}{2}\times\frac{2}{5}+\frac{1}{3}\times\frac{2}{5}=\frac{1}{5}+\frac{2}{15}=\frac{1}{3}\)
\(\frac{3}{22}\times\frac{3}{11}\times22\)
1.\(=\frac{3\times3\times22}{22\times11\times1}\)
\(=\frac{3\times3}{11\times1}\)
\(=\frac{9}{11}\)
2. \(=\frac{9}{242}\times22\)
\(=\frac{198}{242}\)
\(=\frac{9\times2\times11}{2\times11\times11}\)
\(=\frac{9}{11}\)
\(\left(\frac{1}{2}+\frac{1}{3}\right)\times\frac{2}{5}\)
1.\(=\frac{5}{6}\times\frac{2}{5}\)
\(=\frac{5\times2}{3\times2\times5}\)
\(=\frac{1}{3}\)
2.\(\)\(=\frac{1}{2}\times\frac{2}{5}+\frac{1}{3}\times\frac{2}{5}\)
\(=\frac{1}{5}+\frac{2}{15}\)
\(=\frac{3}{15}+\frac{2}{15}\)
\(=\frac{5}{15}=\frac{1}{3}\)
Have a good day
1) \(=\left(\frac{3}{5}+\frac{2}{5}\right).\frac{6}{11}\)
\(=1.\frac{6}{11}\)
\(=\frac{6}{11}\)
2)\(\frac{17}{25}.\left(\frac{11}{19}+\frac{6}{19}+\frac{2}{19}\right)\)
\(=\frac{17}{25}.1\)
\(=\frac{17}{25}\)
a) 2/7 X x = 2/3
X = 2/3 : 2/7
X = 7/3
b) 2/5 : x = 1/3
X = 2/5 : 1/3
X = 6/5
c) x : 7/11 = 22
X = 22 x 7/11
X = 14
d) 1/2 : x = 5
X = 1/2 : 5
X = 1/10
a) \(\dfrac{2}{7}\times x=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}\div\dfrac{2}{7}\)
\(x=\dfrac{7}{3}\)
b) \(\dfrac{2}{5}:x=\dfrac{1}{3}\)
\(x=\dfrac{2}{5}:\dfrac{1}{3}\)
\(x=\dfrac{6}{5}\)
c) \(x:\dfrac{7}{11}=22\)
\(x=22\times\dfrac{7}{11}\)
\(x=\dfrac{154}{11}\)
\(x=14\)
d) \(\dfrac{1}{2}:x=5\)
\(x=\dfrac{1}{2}:5\)
\(x=\dfrac{1}{10}\)
( X - 1/2 ) : 2 = 11/12
X - 1/2 = 11/12 : 2
X - 1/2 = 11/24
X = 11/24 + 1/2
X = 23/24
Mình cũng k biết cs đúng k nữa nếu đúng bạn bảo mình nhaaa ❤❤❤
x - 1/2 = 11/22 . 2
x - 1/2 = 11/11
x - 1/2 = 1
x = 1 + 1/2
x = 2/2 + 1/2
x = 3/2
k đúng cho mình nha!