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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 \(x=4\)
15/26 + x/16 = 46/52
x/16 = 46/52 - 15/26
x/16 = 1/4
x/16 = 4/16
Suy ra: x = 4
Vậy x = 4
\(\frac{15}{26}+\frac{x}{16}=\frac{46}{52}\)
\(\Rightarrow\frac{x}{16}=\frac{45}{52}-\frac{15}{26}\)
\(\Rightarrow\frac{x}{16}=\frac{4}{13}\Rightarrow\frac{64}{208}=\frac{x}{16}=\frac{64}{208}=\frac{x}{208}\Rightarrow x=64\)
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
1)
a) 63 : 32 + 7 . 23
= 63 : 9 + 7 . 4
= 7 + 7 . 4
= 7 + 28
= 35
b) 23 . 15 - [ 115 - 15 . ( 13 - 11 )2 ]
= 8 . 15 - [ 115 - 15 . 22 ]
= 8 . 15 - [ 115 - 15 . 4 ]
= 8 . 15 - [ 115 - 60 ]
= 8 . 15 - 55
= 120 - 55
= 65
c) 53 . 46 + 54 . 74 - 54 . 21
= 53 . 46 + 54 . ( 74 - 21 )
= 53 . 46 + 54 . 53
= 53 . ( 46 + 54 )
= 53 . 100
= 5300
2)
a) 3x - 5 = 2
3x = 2 + 5
3x = 7
x = 7 : 3
x = 2,33333....33 ( có 11 chữ số 3 nhưng 2,3333...33 không phải là số tự nhiên )
b) 46 + 6 ( x - 5 ) = 52
6 ( x - 5 ) = 52 - 46
6 ( x - 5 ) = 6
x - 5 = 6 : 6
x - 5 = 1
x = 1 + 5
x = 6
Bài 2
a 3x-5=2
=> 3x=7
=> x=7/3
b 46+6(x-5)=52
=> 6(x-5)=6
=> x-5=1
=> x=6 ( tick nhé )
\(\frac{15}{26}+\frac{x}{16}=\frac{46}{52}\)
\(\frac{x}{16}=\frac{46}{52}-\frac{15}{26}\)
\(\frac{x}{16}=\frac{4}{13}\)
\(< =>\frac{x}{208}=\frac{64}{208}=\frac{4}{13}\)
\(x=4\)
\(\frac{15}{26}+\frac{x}{16}=\frac{46}{52}\)
\(\Rightarrow\frac{15}{26}+\frac{x}{16}=\frac{23}{26}\)
\(\Rightarrow\frac{x}{16}=\frac{23}{26}-\frac{15}{26}\)
\(\Rightarrow\frac{x}{16}=\frac{4}{13}\)
\(\Rightarrow13x=4.16\)
\(\Rightarrow13x=64\)
\(\Rightarrow x=64:13\)
\(\Rightarrow x=\frac{64}{13}\)
Vậy x = \(\frac{64}{13}\)
_Chúc bạn học tốt_
a) \(\left(2x-1\right)+\frac{3}{15}=\frac{3}{2}\)
\(\Rightarrow2x-1=\frac{3}{2}-\frac{3}{15}=\frac{13}{10}\)
\(\Rightarrow2x=\frac{13}{10}+1=\frac{23}{10}\)
\(\Rightarrow x=\frac{23}{20}\)
b) \(x+\frac{46}{15}=1,5\)
\(\Rightarrow x+\frac{46}{15}=\frac{3}{2}\)
\(\Rightarrow x=\frac{3}{2}-\frac{46}{15}\)
\(\Rightarrow x=\frac{-47}{30}\)
c) \(\left(-2x+1\right)+\frac{3}{15}=\frac{5}{3}\)
\(\Rightarrow-2x+1=\frac{5}{3}-\frac{3}{15}=\frac{22}{15}\)
\(\Rightarrow-2x=\frac{7}{15}\Rightarrow x=\frac{-7}{30}\)
Bài 1. tìm x :
a, -16 + 23 + x = -16
23 + x = -16-(-16)
23 + x = 0
x = 0 - 23
Vậy: x = -23
b, 2x - 35 = 15
2x = 15 + 35
2x = 50
x = 50 : 2
Vậy: x = 25
c, 3x + 17 = 12
3x = 12 - 17
3x = -5
Vậy: x = -5/3
d, | x - 1 | = 0
x - 1 = 0
x = 0 + 1
Vậy: x = 1
e, -13 . | x | = -26
-13 . x = -26
x = -26 : ( -13 )
Vậy: x = 2
Mik làm bài 1 còn bài 2 bn tự làm nha
Hok tốt!!!
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
\(\frac{x}{13}:\frac{15}{16}=\frac{46}{52}\)
\(\Rightarrow\frac{x}{13}=\frac{46}{52}\cdot\frac{15}{16}=\frac{23}{26}\cdot\frac{15}{16}\)
\(\Rightarrow\frac{x}{13}=\frac{345}{416}\)
\(\Rightarrow x=\frac{345}{416}\cdot13=\frac{345}{32}\)
Vậy \(x=\frac{345}{32}\)
K MK ĐI. ~ HỌC TỐT NHA ~
\(\frac{x}{13}:\frac{15}{16}=\frac{46}{52}\)
\(\Rightarrow\frac{x}{13}:\frac{15}{16}=\frac{23}{26}\)
\(\Rightarrow\frac{x}{13}=\frac{23}{26}\times\frac{15}{16}\)
\(\Rightarrow\frac{x}{13}=\frac{345}{416}\)
\(\Leftrightarrow416\times x=13\times345\)
\(\Rightarrow416\times x=4485\)
\(\Rightarrow x=4485:416\)
\(\Rightarrow x=\frac{345}{32}\)