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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) \(\frac{4}{7}:\frac{8}{11}=\frac{4}{7}\times\frac{11}{8}\)
\(=\frac{44}{56}=\frac{22}{23}\)
b) \(\frac{3}{5}+\frac{4}{5}:\frac{2}{5}=\frac{3}{5}+\frac{4}{5}\times\frac{5}{2}\)
\(=\frac{3}{5}+2\)
\(=\frac{13}{5}\)
a: 4/7:8/11=4/7x11/8=44/56=11/14
b: 3/5+4/5:2/5
= 3/5+4/5x5/2
= 3/5+10/5
=13/5
Bài 2 :
a) Tìm x
\(x:\frac{2}{3}=\frac{1}{2}\)
\(x=\frac{1}{2}\times\frac{2}{3}\)
\(x=\frac{1}{3}\)
Vậy \(x=\frac{1}{3}\)
b) Tính giá trị của biểu thức :
\(\frac{5}{7}\times\frac{3}{5}-\frac{10}{14}\times\frac{2}{15}\)
\(=\frac{5}{7}\times\frac{3}{5}-\frac{5}{7}\times\frac{2}{15}\)
\(=\frac{5}{7}\times\left(\frac{3}{5}-\frac{2}{15}\right)\)
\(=\frac{5}{7}\times\frac{7}{15}\)
\(=\frac{1}{3}\)
ủng hộ tớ nha.
Bài 2:
a) x : 2/3 = 1/2
x = 1/2 x 2/3
x = 1/3
b) 5/7 x 3/5 - 10/14 x 2/15
= 3/7 - 5/7 x 2/15
= 3/7 - 2/21 (tự quy đồng)
= 1/3
Bài 1 phần D
Bài 2:
\(\frac{1}{4}\)x\(\frac{5}{3}\):\(\frac{2}{7}\)
= \(\frac{5}{12}\): \(\frac{2}{7}\)
=\(\frac{35}{24}\)
k mình nhá, thanks !!!
a) \(5+\frac{1}{4}=\frac{20}{4}+\frac{1}{4}=\frac{21}{4}\)
b) \(7-\frac{3}{5}=\frac{35}{5}-\frac{3}{5}=\frac{32}{5}\)
b) \(2\times\frac{9}{11}=\frac{18}{11}\)
d) \(\frac{2}{34}:5=\frac{2}{34}:\frac{5}{1}=\frac{2}{34}\times\frac{1}{5}=\frac{2}{170}=\frac{1}{85}\)
ủng hộ nha.
a2/4x4/7= 2/7 b 10/21:5/7=2/3 c10/21:2/3=5/7 d1/5x1/3=1/15
e1/15:1/5=1/3 g 1/15:1/5= 1/3 h 1/15:1/3= 105
k mình nhé bạn
a) 2/5 + 1/2 + 7/10
= 4/10 + 5/10 + 7/10
= 9/10 + 7/10
= 16/10 = 8/5
b) 4/9 + 11/8 - 5/6
= 32/72 + 99/72 - 60/72
= 191/72
c) 9/20 - 8/15 x 5/12
= 9/20 - 2/9
= 41/180
d) 2/3 : 4/5 : 7/12
= 5/6 : 7/12
= 10/7
a) = 64/17 + 38/17 + 230/47 + 52/47
= 102/17 + 282/47
= 6 + 6
= 12
b) = 16/15 + 8/5 + 69/27 + 5/9
= 8/3 + 23/9 + 5/9 (tự quy đồng)
= 8/3 + 28/9 ( // )
= 52/9
Lần này k mình nha !
\(\frac{64}{17}\)\(+\)\(\frac{230}{47}\)\(+\)\(\frac{38}{17}\)\(+\)\(\frac{52}{47}\)\(=\)\(\left[\frac{64}{17}+\frac{38}{17}\right]\)\(+\)\(\left[\frac{230}{47}+\frac{52}{47}\right]\)\(=\)\(6\)\(+\)\(6\)\(=\)\(12\)
\(\frac{16}{15}\)\(+\frac{69}{27}+\frac{5}{9}\)\(+\frac{8}{5}=\)\(5\frac{7}{9}\)Nhớ phải k mình đấy !!!!!!!!!!!!!!!!!!!!!!!!!!!
Năn nỉ dữ quá :))
a) 7/15 + 4/5
= 7/15 + 12/15
= 19/15
b) 1/16 : 11/16
= 1/16 x 16/11
= 1/11
a)=\(\frac{7}{15}\)+\(\frac{12}{15}\)=\(\frac{19}{15}\)
b)\(\frac{1}{16}\)x\(\frac{16}{11}\)=\(\frac{1x16}{16x11}\)=\(\frac{1}{11}\)
tk đi