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( x - 1 ) + 5 = 17
x - 1 = 17 - 5
x - 1 = 12
x = 12 + 1
x = 13
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a) 245 - x = 27 b) 3x + 41 = 56 c) 238: 2x = 17 d) 3x - 90 = 24 e) 2x:5 = 124 h) 26 + 3x = 25 + 46
x = 245 - 27 3x = 56 -41 2x = 238: 17 3x = 24 + 90 2x = 124.5 6 + 3x = 71
x = 218 3x = 15 2x = 14 3x = 114 2x = 620 3x = 71 - 6
x = 15 : 3 x = 14: 2 x = 114: 3 x = 620:2 3x = 65
x = 5 x = 7 x = 38 x = 310 x = 65: 3
x = 21,66
\(a,245-x=27\)
\(x=245-27\)
\(x=218\)
\(b,3x+41=56\)
\(3x=56-41\)
\(3x=15\)
\(x=15:3\)
\(x=5\)
\(c,238:2x=17\)
\(2x=238:17\)
\(2x=14\)
\(x=14:2\)
\(x=7\)
\(d,3x-90=24\)
\(3x=24+90\)
\(3x=114\)
\(x=114:3\)
\(x=38\)
\(e,2x:5=124\)
\(2x=124\times5\)
\(2x=620\)
\(x=620:2\)
\(x=310\)
\(f,7x+4x=110\)
\(\left(7+4\right)x=110\)
\(11x=110\)
\(x=110:11\)
\(x=10\)
\(g,5x-x=444\)
\(\left(5-1\right)x=444\)
\(4x=444\)
\(x=444:4\)
\(x=111\)
\(h,26+3x=25+46\)
\(26+3x=71\)
\(3x=71-26\)
\(3x=45\)
\(x=45:3\)
\(x=15\)
Học tốt
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\(a̸\)
\(\frac{3}{5}-\frac{1}{2}.x=\frac{1}{4}\)
\(\frac{1}{2}.x=\frac{3}{5}-\frac{1}{4}\)
\(\frac{1}{2}.x=\frac{7}{20}\)
\(\Rightarrow\frac{7}{10}\)
\(b̸\)
\(11,3+2\left[x-\frac{1}{3}\right]=\frac{25}{6}\)
\(2\left[x-\frac{1}{3}\right]=\frac{25}{6}-11,3\)
\(2\left[x-\frac{1}{3}\right]=\frac{-107}{15}\)
\(x-\frac{1}{3}=\frac{-107}{15}:2\)
\(x-\frac{1}{3}=\frac{-107}{30}\)
\(x=\frac{-107}{30}+\frac{1}{3}\)
\(x=\frac{-97}{30}\)
\(a)\frac{3}{5}-\frac{1}{2}x=\frac{1}{4}\)
\(\implies\frac{1}{2}x=\frac{3}{5}-\frac{1}{4}\)
\(\implies\frac{1}{2}x=\frac{7}{20}\)
\(\implies x=\frac{7}{20}:\frac{1}{2}\)
\(\implies x=\frac{7}{10}\)
Vậy...
\(b) 11,3+2(x-\frac{1}{3})=\frac{25}{6}\)
\(\implies \frac{113}{10}+2x-2.\frac{1}{3}=\frac{25}{6}\)
\(\implies \frac{113}{10}+2x-\frac{2}{3}=\frac{25}{6}\)
\(\implies \frac{113}{10}+2x=\frac{25}{6}+\frac{2}{3}\)
\(\implies \frac{113}{10}+2x=\frac{29}{6}\)
\(\implies 2x=\frac{29}{6}-\frac{113}{10}\)
\(\implies 2x=\frac{-97}{15}\)
\(\implies x=\frac{-97}{30}\)
Vậy..
\(c)5x-435+2x+140+3x=565\)
\(\implies (5x+2x+3x)+(-435+140)=565\)
\(\implies 10x+(-295)=565\)
\(\implies 10x=565-(-295)\)
\(\implies 10x=860\)
\(\implies x=86\)
Vậy...
~ hok tốt a~
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a, x + 27 = 96 + 17
=> x + 27 = 113
=> x = 113 - 27
=> x = 86
b, x - 210 : 21 = 25
=> x - 10 = 25
=> x = 25 + 10
=> x = 35
c, (x + 8,7) . 10,8 = 270
=> x + 8,7 = 270 : 10,8
=> x + 8,7 = 25
=> x = 25 - 8,7
=> x = 16,3
d, 7 . x - 4 . x = 35 - 2
=> 7 . x - 4 . x = 33
=> x . (7 - 4) = 33
=> x . 3 = 33
=> x = 33 : 3
=> x = 11
#) Dấu "." là nhân nhé!
~Study well~
#KSJ
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x + 2x + 3x = 180
x(1 + 2 + 3) = 180
x . 6 = 180
x = 180 : 6
x = 30.
[3x - 8] + 6 = 25
3x - 8 = 25 - 6
3x - 8 = 19
3x = 27
x = 27 : 3
x = 9.