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Bài 1
x : 34 = 714 92588 : x = 293
x = 714 x 34 x = 92 588 : 293
x = 24 276 x = 316
Bài 2
4237 x 18 - 34 578 46 857 + 3444 : 28 6784 : 64 x 137 601 759 - 1855 : 35
= 76 266 - 34 578 = 46 857 + 123 = 106 x 137 = 601759 - 53
=41 688 = 46 980 = 14 522 = 601 706
( 256 + 378 ) x 12 : 8 43 865 - ( 28 + 31 )
= 634 x 12 : 8 = 43 865 - 59
= 7608 : 8 = 43 806
= 951
x : 34 = 714 92488 : x = 293
x = 714 x 34 x = 92588 : 293
x = 24276 x = 316
2 . tính giá trị biểu thức
4237 x 18 - 34578 = 76266 - 34578 46857 + 3444 : 28 = 46857 + 123
= 41688 = 46980
6784 : 64 x 137 = 106 x 137 601759 - 1855 : 35 = 601759 - 53
= 14522 = 601706
(256 + 378) x 12 : 8 = 634 x 12 : 8 43865 - ( 28 + 318) = 43865 - 346
= 951 = 43519
\(\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}\)
\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}\)
\(=\dfrac{11\times12\times13\times14}{12\times13\times14\times11}\)
\(=1\)
=================
\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)
\(=\dfrac{7}{10}\times\left(3+5+2\right)\)
\(=\dfrac{7}{10}\times10=7\)
\(\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{22}{28}\)
\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}:\dfrac{11}{14}\)
\(=\dfrac{11}{12}\times\dfrac{12}{13}\times\dfrac{13}{14}\times\dfrac{14}{11}\)
\(=\dfrac{11\times12\times13\times14}{12\times13\times11\times14}\)
\(=1\)
\(3\times\dfrac{7}{10}+\dfrac{7}{10}\times5+2\times\dfrac{7}{10}\)
\(=\dfrac{7}{10}\times\left(3+5+2\right)\)
\(=\dfrac{7}{10}\times10\)
\(=7\)
\(\frac{24}{36}:\frac{8}{9}=\frac{24}{36}\cdot\frac{9}{8}=\frac{24\cdot9}{36\cdot8}=\frac{216}{288}=\frac{3}{4}\)
\(\frac{32}{45}-\frac{7}{30}=\frac{64}{90}-\frac{21}{90}=\frac{43}{90}\)
\(\frac{3}{10}+\frac{4}{7}+\frac{6}{14}+\frac{4}{20}=\frac{42}{140}+\frac{80}{140}+\frac{60}{140}+\frac{28}{140}=\frac{210}{140}=\frac{3}{2}\)
\(\frac{17}{25}\cdot\frac{11}{28}+\frac{34}{50}\cdot\frac{17}{28}=\frac{187}{700}+\frac{289}{700}=\frac{476}{700}=\frac{17}{25}\)
\(\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}+...+\frac{1}{11\cdot12}=\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{11}-\frac{1}{12}=\frac{1}{3}-\frac{1}{12}=\frac{1}{4}\)
a, 178 593 + 5x = 427 158
5x = 427 158 - 178 593
5x = 248 565
x = 248 565 : 5
x = 49 713
b, 976 318 - x : 2 = 764 280
x : 2 = 976 318 - 764 280
x : 2 = 212 038
x = 212 038 x 2
x = 424 076
ta gọi số đó là:a ta có:
a + 1/2 x 7 = 28
a + 1/2 = 28 : 7
a + 1/2 = 4
a = 4+ 1/2
a = 9/2
Ta có: (a + 1/2) x 7 = 28
\(\Rightarrow\) a + 1/2 = 28 : 4 = 7
\(\Rightarrow\) a = 7 - 1/2 = 13/2 = 6,5
Vậy a = 6,5
41602
41611 day nho k nha nho k nha