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Nua cv là:160÷2=80(m)
Cd là:(80+20)÷2=50(m)
Cr là:80-50=30(m)
Dt là:30×50=1500(m)
Số tạ thóc là:1500÷100=15(tạ)
Đổi:15 tạ=150 yến
Đáp số:150 yến thóc
x : 4 + x * 5 = 7
x *\(\frac{1}{4}\)+ x * 5 = 7
x * ( \(\frac{1}{4}\)+ 5 ) = 7
x * \(\frac{21}{4}\)= 7
x = 7 : \(\frac{21}{4}\)
x = \(\frac{4}{3}\)
x : 4 + x * 5 =7
x *1/4 +x *5 =7
x*(1/4 +5) =7
x * (1/4+20/4)=7
x * 21/4 =7
x =7 : 21/4
x =7 * 4/21
x = 4/3
ta có a chia 3,4,5 dư 2,3,4 nên a+1 chia hết cho 3,4,5 mà BCNN của 3,4,5 là 60
a+1=60 nên a=50
3/5+6/11+7/13+2/5+6/11+19/3
= (3/5+2/5)+(6/11+6/11)+7/13+19/3
= 1 + 12/11 + 7/13+19/3
= 23/11 + 7/13+19/3
= 23/11 + 268/39
= 3845/429
\(\frac{2}{3}:\frac{5}{6}=\frac{4}{5}\)
\(\frac{4}{5}\cdot\frac{2}{3}=\frac{8}{15}\)
Vậy : \(\frac{2}{3}:\frac{5}{6}< \frac{4}{5}x\cdot\frac{2}{3}\)nên \(\frac{4}{5}< \frac{8}{15}\)
Mình làm câu A
\(\frac{1}{2}\cdot\frac{3}{4}=\frac{3}{8}\)\(;\frac{5}{8}:\frac{6}{8}=\frac{5}{6}\)
Vậy \(\frac{1}{2}\cdot\frac{3}{4}< \frac{5}{8}:\frac{6}{8}\)
Nên : \(\frac{3}{8}< \frac{5}{6}\)
15/16 x 8/3 x3/4=5
7/8 :2=7/(8 x 2)=7/16
15/16 : 3/8 x 3/4
= 15/16 x 8/3 x 3/4
= 5/2 x 3/4
= 15/8
7/8 : 2
= 7/8 x 1/2
= 7/16
(7/12 + 5/9 x 3/8) : 19/15
= (7/12 + 5/24) x 15/19
= (14/24 + 5/24) x 15/19
= 19/24 x 15/19
= 5/8
\(\frac{15}{16}:\frac{3}{8}\times\frac{3}{4}=\frac{15}{16}\times\frac{3}{8}\times\frac{3}{4}=\frac{15\times3\times3}{16\times8\times4}=\frac{135}{512}\)
\(7:\frac{8}{2}=7\times\frac{2}{8}=7\times\frac{1}{4}=\frac{7}{4}\)
\(\left[\frac{7}{12}+\frac{5}{9}\times\frac{3}{8}\right]:\frac{19}{15}\)
\(=\left[\frac{7}{12}+\frac{5\times3}{9\times8}\right]:\frac{19}{15}\)
\(=\left[\frac{7}{12}+\frac{5\times1}{3\times8}\right]:\frac{19}{15}\)
\(=\left[\frac{7}{12}+\frac{5}{24}\right]:\frac{19}{15}\)
\(=\left[\frac{14}{24}+\frac{5}{24}\right]:\frac{19}{15}\)
\(=\frac{19}{24}:\frac{19}{15}=\frac{19}{24}\times\frac{15}{19}=\frac{19\times15}{24\times19}=\frac{1\times5}{8\times1}=\frac{5}{8}\)
15/16:3/8x3/4
= 15/16x8/3x3/4
=5/2x3/4
=15/8
b,7/8:2
=7/8:2/1
=7/8.1/2
=7/16
c,(7/12+5/9x3/8):19/15
=(7/12x5/24)x15/19
=35/288x15/19
=525/5472
\(\frac{15}{16}:\frac{3}{8}\times\frac{3}{4}\)
\(=\frac{15}{16}\times\frac{8}{3}\times\frac{3}{4}\)
\(=\frac{5}{2}\times\frac{1}{1}\times\frac{3}{4}\)
\(=\frac{5}{2}\times\frac{3}{4}\)
\(=\frac{15}{8}\)
\(\frac{7}{8}:2\)
\(=\frac{7}{8}\times\frac{1}{2}\)
\(=\frac{7}{16}\)
\(\left(\frac{7}{12}+\frac{5}{9}\times\frac{3}{8}\right):\frac{19}{15}\)
\(=\left(\frac{7}{12}+\frac{5}{3}\times\frac{1}{8}\right)\times\frac{15}{19}\)
\(=\left(\frac{7}{12}+\frac{5}{24}\right)\times\frac{15}{19}\)
\(=\left(\frac{14}{24}+\frac{5}{24}\right)\times\frac{15}{19}\)
\(=\frac{19}{24}\times\frac{15}{19}\)
\(=\frac{1}{8}\times\frac{5}{1}\)
\(=\frac{5}{8}\)