x/ 13 + 15/25 = 46/52
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Nhầm, làm lại nhé!
\(\frac{x}{13}+\frac{15}{26}=\frac{46}{52}\)
\(\frac{x}{13}+\frac{15}{26}=\frac{23}{26}\)
\(\frac{x}{13}=\frac{23}{26}-\frac{15}{26}\)
\(\frac{x}{13}=\frac{23}{26}-\frac{15}{26}\)
\(\frac{x}{13}=\frac{4}{13}\)
\(\Rightarrow x=\frac{13.4}{13}=4\)
Vậy \(x=4\)
\(\frac{x}{13}:\frac{15}{16}=\frac{46}{52}\)
\(\Rightarrow\frac{x}{13}=\frac{46}{52}\cdot\frac{15}{16}=\frac{23}{26}\cdot\frac{15}{16}\)
\(\Rightarrow\frac{x}{13}=\frac{345}{416}\)
\(\Rightarrow x=\frac{345}{416}\cdot13=\frac{345}{32}\)
Vậy \(x=\frac{345}{32}\)
K MK ĐI. ~ HỌC TỐT NHA ~
\(\frac{x}{13}:\frac{15}{16}=\frac{46}{52}\)
\(\Rightarrow\frac{x}{13}:\frac{15}{16}=\frac{23}{26}\)
\(\Rightarrow\frac{x}{13}=\frac{23}{26}\times\frac{15}{16}\)
\(\Rightarrow\frac{x}{13}=\frac{345}{416}\)
\(\Leftrightarrow416\times x=13\times345\)
\(\Rightarrow416\times x=4485\)
\(\Rightarrow x=4485:416\)
\(\Rightarrow x=\frac{345}{32}\)
x/3 + 15/26 = 46/52
x/13 + 15/26 = 23/26
x/13 = 23/26 - 15/26
x/13 = 4/13
Có x/13 = 4/13
Suy ra : x = 4
Vậy x = 4
15 x 98 - 15 x 46 - 52 x 25
= 15 x (98 - 46) - 52 x 25
= 15 x 52 - 52 x 25
= (15 - 25) x 52
= -10 x 25 = -250
\(15\times98-15\times46-52\times25\)
\(=15\times\left(98-46\right)-52\times25\)
\(=15\times52-52\times25\)
\(=52\times\left(15-25\right)\)
\(=52\times\left(-10\right)\)
\(=-520\)
uingr hộ mk nha mọi người
1) (-6 - 2) . (-6 + 2) = -8 . (-4) = 32
2) 627 + 125 + (-627) + |-46| -21 = 125 + 46 - 21 = 150
3) (-25) + 30 + (-16) + 25 + (-4) = 30 + (-20) = 10
4) 75 - 5.(15 - 40) - (-60) = 75 - 75 + 80 + 60 = 140
5) |31 - 17| - |15 - 52| = |14| - |-37| = 14 - 37 = -23
6) 13 - 18 - (-42) - 15 = 13 - 18 + 42 - 15 = 22
3 bài sau hết kiên nhẫn rồi, thông cảm nhé.
a) \(...=-\dfrac{12}{46}-\dfrac{15}{21}+\dfrac{3}{7}-\dfrac{7}{23}\)
\(=-\dfrac{12}{46}-\dfrac{7}{23}-\dfrac{15}{21}+\dfrac{3}{7}\)
\(=-\dfrac{6}{23}-\dfrac{7}{23}-\dfrac{5}{7}+\dfrac{3}{7}\)
\(=-\dfrac{13}{23}-\dfrac{2}{7}\)
\(=-\dfrac{13.7}{23.7}-\dfrac{2.23}{23.7}\)
\(=-\dfrac{91}{161}-\dfrac{46}{161}=-\dfrac{137}{161}\)
b) \(...=-21+\dfrac{7}{9}-\dfrac{3}{17}+\dfrac{25}{9}\)
\(=-21-\dfrac{3}{17}+\dfrac{7}{9}+\dfrac{25}{9}\)
\(=-21-\dfrac{3}{17}+\dfrac{32}{9}\)
\(=-\dfrac{3213}{153}-\dfrac{27}{153}+\dfrac{544}{153}=-\dfrac{2696}{153}\)
a) (44 x 52 x 60) : (11 x 13 x 15)
= (44 : 11) x ( 52 : 13) x (60 : 15)
= 4 x 4 x 4 = 64
d) 1 + 6 + 11 + 16 + ... + 46 + 51
Ta có : 1 + 6 + 11 + 16 + ... + 46 + 51 ( có 11 số )
= (51 + 1) x 11 : 2 = 286
a) (44 x 52 x 60) : (11 x 13 x 15)
= 44 x 52 x 60 : 11 : 13 : 15
= (44 : 11) x (52 : 13) x (60 : 15)
= 4 x 4 x 4
= 64
b) 2016 x 20152015 - 2015 x 20162016
= 2016 x (20150000 + 2015) - 2015 x (20160000 + 2016)
= 2016 x (2015 x 10000 + 2015) - 2015 x (2016 x 10000 + 2016)
= 2016 x [2015 x (10000 + 1)] - 2015 x [2016 x (10000 + 1)]
= 2016 x 2015 x 10001 - 2015 x 2016 x 10001
= 0
c) 46 x 37 + 46 x 63 + 54 x 267 - 54 x 167
= 46 x (37 + 63) + 54 x (267 - 167)
= 46 x 100 + 54 x 100
= 100 x (46 + 54)
= 100 x 100
= 10000
X= 4 phải ko mọi người
ko phải