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A\(\frac{7}{8}+\frac{7}{12}+\frac{9}{8}+\frac{5}{12}\)
\(=\left(\frac{7}{12}+\frac{5}{12}\right)+\left(\frac{7}{8}+\frac{9}{8}\right)\)
\(=1+2\)
\(=3\)
\(\frac{2}{6}+\frac{9}{24}\)
\(=\frac{8}{24}+\frac{9}{24}\)
\(=\frac{17}{24}\)
Tương Tự vs các câu còn lại
\(\frac{7}{2}+\frac{1}{3}-\frac{5}{2}\)
\(=\left(\frac{7}{2}-\frac{5}{2}\right)+\frac{1}{3}\)
\(=1+\frac{1}{3}\)
\(=\frac{4}{3}\)
Đề bài sai nhé!
A, X x 4/8 = 4/8
x = 4/8 : 4/8
x = 1
B, 1/9 + x + 1 - 3/18
= 1/9 + 1 + 1 - 3/18
= 35/18
A, 5/6 + 13/6 = 3
B, 9/16 - 3/8 = 3/16
C, 2/9 x 5/3 = 10/27
D, 4/6 + 7/3 x 5/2 = 13/2
A)
\(\frac{7}{12}+\frac{3}{4}\times\frac{2}{4}\)
\(=\frac{7}{12}\times\left(\frac{3}{4}+\frac{2}{4}\right)\)
\(=\frac{35}{48}\)
B)
\(\frac{8}{9}-\frac{4}{15}:\frac{2}{5}\)
\(=\frac{8}{9}-\frac{2}{3}\)
\(=\frac{6}{27}\)
\(\dfrac{3}{4}:\dfrac{5}{4}:\dfrac{3}{5}:\dfrac{3}{8}=\dfrac{3}{5}:\dfrac{3}{5}:\dfrac{3}{8}=1:\dfrac{3}{8}=\dfrac{8}{3}\)
a) 3/5:3/4=3/5x4/3=(3x4)/(5x3)=12/15=4/5
b)2/5:3/10=2/5x10/3=(2x10)/(5x3)=20/15=4/3
c)9/8:3/4=9/8x4/3=(9x4)/(8x3)=36/32=9/8
d)1/4:1/2=1/4x2=2/4=1/2
e)1/8:1/6=1/8x6=6/8=3/4
g)1/5:1/10=1/5x10=10/5=2
\(3/4 + 2/1 = 3/4 + 8 / 4 = 11/4\)
\(2/3 - 3/8 = 16/24 - 9 / 24 = 7 /24\)
2/9 . 3/8 = 6 /72
18/1 . 3 / 2 = 54 / 2
a)\(=\dfrac{3}{4}+\dfrac{8}{4}=\dfrac{11}{4}\)
b)\(=\dfrac{16}{24}-\dfrac{9}{24}=\dfrac{7}{24}\)
c)\(=\dfrac{2\times3}{9\times8}=\dfrac{6}{72}=\dfrac{1}{12}\)
d)\(=18\times\dfrac{3}{2}=\dfrac{54}{2}=27\)