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a) x + 527 = 1892
x = 1892 - 527
x = 1365
b) x – 631 = 361
x = 361 + 631
x = 992
c) x × 5 = 1085
x = 1085 : 5
x = 217
d) x : 5 = 187
x = 187 × 5
x = 935
a, \(x+527=1892\)
\(< =>x=1892-527=1365\)
b, \(x-631=361\)
\(< =>x=361+631=992\)
c, \(x.5=1085\)
\(< =>x=\frac{1085}{5}=217\)
d, \(x:5=187\)
\(< =>x=187.5=935\)
b. \(\dfrac{4.2.3.5.2.6.2.5.3}{4.3.4.5.6.4.5.6}=\dfrac{1}{4}\)
c. \(\dfrac{17.2.101.2005}{17.2.101.2.2005}=\dfrac{1}{2}\)
d. \(\dfrac{2.3.4.2.11.13.17}{3.11.4.4.17.13.2}=\dfrac{1}{2}\)
a)\(\dfrac{4\times6\times10\times12\times15}{4\times12\times5\times24\times30}=\dfrac{2}{2\times2\times2}=\dfrac{2}{8}=\dfrac{1}{4}\)
b)\(\dfrac{34\times101\times2005}{17\times202\times4010}=\dfrac{2}{2\times2}=\dfrac{2}{4}=\dfrac{1}{2}\)
c)\(\dfrac{6\times8\times11\times13\times17}{33\times16\times17\times26}=\dfrac{6}{3\times2\times2}=\dfrac{1}{2}\)
`23/34 xx 17/15 xx5/46`
`= 23/30 xx 5/46`
`= 1/12`
a: \(\dfrac{5}{3}\cdot\dfrac{7}{10}=\dfrac{5}{10}\cdot\dfrac{7}{3}=\dfrac{14}{3}>2\)
\(\dfrac{5}{7}:\dfrac{7}{10}=\dfrac{5}{7}\cdot\dfrac{10}{7}=\dfrac{50}{49}< 2\)
=>\(\dfrac{5}{3}\cdot\dfrac{7}{10}>\dfrac{5}{7}:\dfrac{7}{10}\)
b: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{4}{6}=\dfrac{2}{3}\)
\(\dfrac{8}{9}:\dfrac{4}{3}=\dfrac{8}{9}\cdot\dfrac{3}{4}=\dfrac{8}{4}\cdot\dfrac{3}{9}=\dfrac{2}{3}\)
Do đó: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{8}{9}:\dfrac{4}{3}\)
c: \(\dfrac{5}{11}\cdot\dfrac{33}{15}=\dfrac{5}{15}\cdot\dfrac{33}{11}=\dfrac{3}{3}=1\)
\(\dfrac{6}{17}\cdot\dfrac{34}{25}=\dfrac{34}{17}\cdot\dfrac{6}{25}=2\cdot\dfrac{6}{25}=\dfrac{12}{25}< 1\)
=>\(\dfrac{5}{11}\cdot\dfrac{33}{15}>\dfrac{6}{17}\cdot\dfrac{34}{25}\)
d: \(\dfrac{15}{19}\cdot\dfrac{38}{5}=\dfrac{15}{5}\cdot\dfrac{38}{19}=3\cdot2=6\)
\(\dfrac{15}{16}:\dfrac{3}{8}=\dfrac{15}{16}\cdot\dfrac{8}{3}=\dfrac{15}{3}\cdot\dfrac{8}{16}=\dfrac{5}{2}\)<6
=>\(\dfrac{15}{19}\cdot\dfrac{38}{5}>\dfrac{15}{16}:\dfrac{3}{8}\)
1. Tính
23 x 46 = 1058
34 x 10 = 340
54 x 46 = 2484
17 x 35 = 595
19 x 30 = 570
2 Tìm X :
a) X : 11 = 35 b) X : 11 = 87 c) X - 425 = 625
X = 35 x 11 X = 87 x 11 X = 625 + 425
X = 385 X = 957 X = 1050
Vậy X = 385 Vậy X = 957 Vậy X = 1050
d) X - 103 = 99 e) X + 527 = 1892 f) X x 5 = 1085
X = 99 + 103 X = 1892 - 527 X = 1085 : 5
X = 202 X = 1365 X = 217
Vậy X = 202 Vậy X = 1365 Vậy X = 217