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a, 440 + 2 . (125 - x) = 546
2 . (125 - x) = 546 - 440
2 . (125 - x) = 106
125 - x = 106 : 2
125 - x = 53
x = 125 - 53
x = 72
[(6x-18):3+25].2=78
[(6x-18):3+25]=78:2
[(6x-18):3+25]=39
(6x-18):3=39-25
(6x-18):3=14
6x-18=14.3
6x-18=42
6x=42+18
6x=60
x=60:6
x=10
Ta có: (6x - 18) : 3 + 25 x 2 = 78
=> (6x - 18) : 3 + 50 = 78
=> (6x - 18) : 3 = 78 - 50 = 28
=> 6x - 18 = 28 x 3 = 84
=> 6x = 84 + 18 = 102
=> x = 102 : 6 = 17
Vậy x = 17
[ 25 + ( 6x - 18 ) : 3 ] . 2 = 78
[ 25 + ( 6x - 18 ) : 3 ] = 78 : 2
[ 25 + ( 6x - 18 ) : 3 ] = 39
( 6x - 18 ) : 3 = 39 - 25
( 6x - 18 ) : 3 = 14
6x - 18 = 14 . 3
6x - 18 = 42
6x = 42 + 18
6x = 60
x = 60 : 6
Vậy:x = 10
Hok tốt !!!
\(9^{x-1}=9\)
\(9^{x-1}=9^1\)
\(x-1=1\)
\(x=1+1\)
\(x=2\)
\(\frac{6x-18}{3}+25\times2=78\)
\(\frac{6\left(x-3\right)}{3}+50=78\)
\(2\left(x-3\right)=78-50\)
\(2x-6=28\)
\(2x=28+6\)
\(2x=34\)
\(x=\frac{34}{2}\)
\(x=17\)
a) \(9^{x-1}=9\)
\(\Rightarrow x-1=1\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
b) \(\left(6x-18\right):3+25.2=78\)
\(\Rightarrow3\left(2x-6\right):3+50=78\)
\(\Rightarrow2x-6=38\)
\(\Rightarrow2x=44\)
\(\Rightarrow x=22\)
Vậy \(x=22\)
1: \(78+22+18\)
\(=\left(78+22\right)+18\)
=100+18
=118
2: \(94+563+\left(106-563\right)-\left(-70\right)\)
\(=94+563+106-563+70\)
\(=\left(94+106\right)-\left(563-563\right)+70\)
=100-0+70
=170
3: \(25\cdot154-25+47\cdot25\)
\(=25\left(154-1+47\right)\)
\(=25\cdot200=5000\)
4: \(\left[5^{29}+5^{30}\left(16-11\right)\right]:5^{29}\)
\(=\left(5^{29}+5^{30}\cdot5\right):5^{29}\)
\(=\dfrac{5^{29}\cdot1+5^{29}\cdot5^2}{5^{29}}\)
\(=1+5^2=26\)
8: \(25\cdot2^3-\left(9-14\right)+\left(29-34+20\right)\)
\(=25\cdot8-\left(-5\right)+\left(-5\right)+20\)
\(=200+5-5+20\)
=220
\(\frac{-7}{25}.\frac{11}{13}+\frac{-7}{25}.\frac{2}{13}-\frac{18}{25}\)
= \(\frac{-7}{25}.\left(\frac{11}{13}+\frac{2}{13}\right)-\frac{18}{25}\)
= \(\frac{-7}{25}-\frac{18}{25}\)
= - 1
(6.x-18):3+25,2=78
(6.x-6.3):3=78-25,2
(x-3).6:3=52,8
(x-3).2=52,8
x-3=52,8:2
x-3=26,4
x=26,4+3
x=29,4
chúc bạn học tốt nha
(6x—18):3+25,2=78
(6x—18):3 =78–25,2
(6x—18):3=52,8
6x—18=52,8x3
6x—18=158,4
6x=158,4+18
6x=176,4
x=176,4:6
x=29,4