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a) Ta thấy: 7/9<1, 11/13<1, 24/25<1 nên 7/9+11/13+24/25<3
b) Ta thấy: 9/8>1, 13/12>1, 15/13>1, 5/4>1 nên 9/8+13/12+15/13+5/4>4
a) 45 x 789 + 15 x 263 + 60 x 789 - 10 x 789 = 35505 + 3945 + 47340 - 7890
= 39450 + 47340 - 7890
= 86790 - 7890
= 78900.
b) 234 x 17 + 34 x 117 + 198 x 78 = 3978 + 3978 + 15444
= 7956 + 15444
= 23400.
k nha
a = 500 + x = 500 + 8075 = 8575
b = x - 500 = 8075 - 500 = 7575
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)\(\dfrac{6\times8\times11\times13\times17}{33\times16\times17\times26}=\dfrac{6}{3\times2\times2}=\dfrac{1}{2}\)
1a) \(\frac{12}{17}+\frac{19}{17}+\frac{8}{17}\)
\(=\left(\frac{12}{17}+\frac{8}{17}\right)+\frac{19}{17}\)
\(=\frac{20}{17}+\frac{19}{17}\)
\(=\frac{39}{17}\)
b) \(\frac{2}{5}+\frac{7}{12}+\frac{13}{12}\)
\(=\frac{2}{5}+\frac{5}{3}\)
\(=\frac{31}{15}\)
2) \(\frac{25}{3}-x=\frac{5}{6}\)
\(x=\frac{25}{3}-\frac{5}{6}\)
\(x=\frac{45}{6}\)
ủng hộ tớ nha
a)12 x ( 367 + 82 ) = 82 x 12 + 12 x 367
b) ( 175 - 26 ) x 17 < 17 x 177 - 17 x 26
a)Vì 12 x ( 367 + 82 ) = 5 388;82 x 12 + 12 x 367 = 5 388
b)Vì ( 175 - 26 ) x 17 = 2 533;17 x 177 - 17 x 26 =2 567
Ban oi de bai bao ko tinh ket qua co