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\(\frac{5}{3}\cdot\frac{4}{7}\cdot\frac{3}{5}\cdot\frac{7}{8}\)
\(=\frac{1}{2}\)
128.72 + 14.256
= 128.72 + 14.2.128
= 128.(72 + 14.2)
= 128.100
= 12800
\(\frac{5}{3}\cdot\frac{4}{7}\cdot\frac{3}{5}\cdot\frac{7}{8}\)
\(=\left(\frac{5}{3}\cdot\frac{3}{5}\right)\cdot\left(\frac{4}{7}\cdot\frac{7}{8}\right)\)
\(=1\cdot\frac{1}{2}\)
\(=\frac{1}{2}\)
\(128\cdot72+14\cdot256\)
\(=128\cdot2\cdot36+14\cdot256\)
\(=256\cdot36+14\cdot256\)
\(=256\cdot\left(36+14\right)\)
\(=256\cdot50\)
\(=12800\)
Học tốt #
gạch tất cả số 5, 9, 13
là bằng 4.x/1 + 4.x/17
rồi gợi ý thế thôi nhé
\(\frac{4.x}{1.5}+\frac{4.x}{5.9}+\frac{4.x}{9.13}+\frac{4.x}{13.17}=16\)
\(x.\left(\frac{4}{1.5}+\frac{4}{5.9}+\frac{4}{9.13}+\frac{4}{13.17}\right)=16\)
\(x.\left(1-\frac{1}{5}+\frac{1}{5}-\frac{1}{9}+\frac{1}{9}-\frac{1}{13}+\frac{1}{13}-\frac{1}{17}\right)=16\)
\(x.\left(1-\frac{1}{17}\right)=16\)
\(x.\frac{16}{17}=16\Rightarrow x=16:\frac{16}{17}=16.\frac{17}{16}\)
\(\Rightarrow x=17\)
\(\frac{2}{3}.\frac{4}{5}+\frac{1}{3}.\frac{4}{5}=\frac{4}{5}\left(\frac{2}{3}+\frac{1}{3}\right)=\frac{4}{5}.\frac{3}{3}=\frac{4}{5}.1=\frac{4}{5}\)
\(\frac{1}{2}:\frac{3}{4}+\frac{1}{6}:\frac{3}{4}=\frac{3}{4}:\left(\frac{1}{2}+\frac{1}{6}\right)=\frac{3}{4}:\frac{2}{3}=\frac{9}{8}\)
\(\frac{2}{3}.\frac{4}{5}-\frac{1}{3}.\frac{4}{5}=\frac{4}{5}\left(\frac{2}{3}-\frac{1}{3}\right)=\frac{4}{5}.\frac{1}{3}=\frac{4}{15}\)
\(\frac{1}{2}:\frac{3}{4}-\frac{1}{6}:\frac{3}{4}=\frac{3}{4}:\left(\frac{1}{2}-\frac{1}{6}\right)=\frac{3}{4}:\frac{1}{3}=\frac{9}{4}\)
\(\frac{2}{3}.\frac{4}{5}+\frac{1}{3}.\frac{4}{5}=\left(\frac{2}{3}+\frac{1}{3}\right).\frac{4}{5}=1.\frac{4}{5}=\frac{4}{5}\)
\(\frac{1}{2}:\frac{3}{4}+\frac{1}{6}:\frac{3}{4}=\frac{1}{2}.\frac{4}{3}+\frac{1}{6}.\frac{4}{3}=\left(\frac{1}{2}+\frac{1}{6}\right).\frac{4}{3}=\frac{2}{3}.\frac{4}{3}=\frac{8}{9}\)
c,d tương tự
\(\frac{28}{700}=28.\frac{28.}{700.}\)
\(\frac{28}{700}:28=\frac{28.}{700.}\)
\(\frac{1}{700}=\frac{28.}{700.}\)
=> \(\frac{1}{700}:\frac{28}{700}=\frac{1}{28}\)
Vậy số cần tìm ở phần tử số là 1, số cần tìm ở phần mẫu số là 28
K mk nha bạn, mk nhanh nhất thật
\(\frac{1995}{1996}.\frac{19961996}{19311931}.\frac{19311931}{19951995}=\frac{1995}{1996}.\frac{1996}{1931}.\frac{1931}{1995}=1\)
\(\frac{1313}{2121}.\frac{165165}{143143}.\frac{424242}{151515}=\frac{13}{21}.\frac{165}{143}.\frac{42}{15}=\frac{1}{1}.\frac{11}{11}.\frac{2}{1}=2\)
8,96 : X =2,03 -0,5
8,96 :X = 1,53
X = 8,96 -1,53
X = 7,43
1,2 .X = 0,54 - 0,06
1,2 .X = 0,48
X = 1,2 : 0,48
X = 2,5
\(\frac{17}{5}\)= 2\(\frac{7}{5}\); \(\frac{139}{12}\)= 10\(\frac{19}{12}\); \(\frac{150}{13}\)= 11\(\frac{7}{13}\)
NHỚ TK CHO MÌNH NHÉ
a,
x.2/7.3/4=5/21
x.3/14=5/21
x=5/21:3/14
x=10/9
b,
x.1/2=1/3
x=1/3:1/2
x=2/3
c,
x:4/5=25/8:5/4
x:4/5=5/2
x=5/2.4/5=2
A, x= 5/25 : 3/4 : 2/7 = 14/15
B, x=1/3 : 1/2 = 2/3
C, x=(25/8 : 5/4)x4/5 = 5/2 x 4/5 = 2
Câu b:
\(\frac{21}{8}:\frac{5}{6}+\frac{1}{2}:\frac{5}{6}\)
= \(\frac{63}{20}+\frac{3}{5}\)
= \(\frac{15}{4}\)
\(\left(\frac{21}{8}+\frac{1}{2}\right):\frac{5}{6}\)
\(\frac{25}{8}:\frac{5}{6}\)
\(\frac{25}{8}.\frac{6}{5}\)
\(\frac{30}{8}\)
a: \(\frac23\times\frac45+\frac23\times\frac15+\frac23\)
\(=\frac23\times\left(\frac45+\frac15\right)+\frac23\)
\(=\frac23+\frac23=\frac43\)
b: \(\frac{2022\times2023+2000}{2023\times2023-23}\)
\(=\frac{2022\times2023+2000}{2022\times2023+2023-23}\)
\(=\frac{2022\times2023+2000}{2022\times2023+2000}\)
=1