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a) \(\dfrac{7}{13}\)\(\times\)\(\dfrac{7}{15}\)-\(\dfrac{5}{12}\)\(\times\)\(\dfrac{21}{39}+\dfrac{49}{91}\)\(\times\)\(\dfrac{8}{15}\)
= \(\dfrac{7}{13}\)\(\times\)\(\dfrac{7}{15}\)-\(\dfrac{5}{12}\times\dfrac{7}{13}+\dfrac{7}{13}\times\dfrac{8}{15}\)
= \(\dfrac{7}{13}\left(\dfrac{7}{15}-\dfrac{5}{12}+\dfrac{8}{15}\right)\)
= \(\dfrac{7}{13}\times\dfrac{7}{12}\)
= \(\dfrac{49}{156}\)
b) \(\left(\dfrac{12}{199}+\dfrac{23}{200}-\dfrac{34}{201}\right)\times\left(\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{6}\right)\)
= \(\left(\dfrac{12}{199}+\dfrac{23}{200}-\dfrac{34}{201}\right)\times0\)
= 0
a) ( 6x - 39 ) : 3 = 201
( 6x - 39 ) =201.3
( 6x - 39 ) =603
6x=603+39
6x=642
x=642:6
x=107
câu 1:23+3x=5mu3=125-23=102:3=34.the la xong.minh lam tat
a) 6x + x = 511 : 59 + 31
7x = 52 + 3
7x = 25 + 3
7x = 28
x = 28 : 7
x = 4
b) 5x + 3x = 36 : 33 . 4 + 12
8x = 33 . 4 + 12
8x = 27 . 4 + 12
8x = 108 + 12
8x = 120
x = 120 : 8
x = 15
a) \(6x+x=5^{11}:5^9+3^1\)
\(7x=25+3\)
\(7x=28\)
\(x=4\)
b) \(5x+3x=3^6:3^3.4+12\)
\(8x=27.4+12\)
\(8x=108+12\)
\(8x=120\)
\(x=15\)
a, \(\frac{2}{3}x-\frac{3}{2}x=\frac{5}{12}\)
\(\left(\frac{2}{3}-\frac{3}{2}\right)x=\frac{5}{12}\)
\(\frac{-5}{6}x=\frac{5}{12}\)
x = \(\frac{-1}{2}\)
Vậy x = \(\frac{-1}{2}\)
~~~
#Sunrise
a) 25 + 3x = 25 - 1
3x = -1
x = -1/3
b) (6x-39):13 = 201
6x-39 = 2613
6x = 2652
x = 442
c) 2x + 35:34 = 510 : 58
2x + 3 = 25
2x = 22
...
( 6x - 39) : 3 = 201
\(\Leftrightarrow6x-39=603\)
\(\Leftrightarrow6x=642\)
\(\Leftrightarrow x=107\)
23+3x=56:53
\(\Leftrightarrow23+3x=5^3\)
\(\Leftrightarrow3x=125-23\)
\(\Leftrightarrow3x=102\)
\(\Leftrightarrow x=34\)
( 6x - 39 ) :3 = 201
6x - 39 = 201 x 3
6x - 39 = 603
6x = 603 +39
6x = 742
x = 742 :6
x =122
chắc là đúng. Bạn nên thử lại