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a)x\(\in\){8;18} và y\(\in\){7;2}
b)x=6
c)x=-5; y=-3
d)x=7
e)x=4
Dễ vậy!
a)2-x=17-(-5)
2-x=17+5
2-x=22
x=2-20
x=-20
b)x-12=-9-15
x-12=-24
x=(-24)+12
x=-12
c)11-(15+11)=x-(25-9)
11-26=x-16
-15=x-16
x=-15+16
x=1
d)x-25=(7-x)-(25+7)
x-25=(7-x)-32
2x-25=7-32
2x-25=-25
2x=(-25)+25
2x=0
x=0:2
x=0
tick cho mk nha bạn
a)2-x=17-(-5)
2-x=17+5
2-x=22
x=2-20
x=-20
b)x-12=-9-15
x-12=-24
x=(-24)+12
x=-12
c)11-(15+11)=x-(25-9)
11-26=x-16
-15=x-16
x=-15+16
x=1
d)x-25=(7-x)-(25+7)
x-25=(7-x)-32
2x-25=7-32
2x-25=-25
2x=(-25)+25
2x=0
x=0:2
x=0
\(1\)) \(5-\left(10-x\right)=7\)
\(10-x=5-7\)
\(10-x=-2\)
\(x=10-\left(-2\right)\)
\(x=12\)
\(2\)) \(-32-\left(x-5\right)=0\)
\(x-5=-32-0\)
\(x-5=-32\)
\(x=-32+5\)
\(x=-27\)
2: \(=\dfrac{-2}{75}+\dfrac{5}{39}=\dfrac{33}{325}\)
3: \(=\dfrac{6}{11}\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{6}{11}\)
4: \(=\dfrac{7}{19}\left(\dfrac{5}{13}+\dfrac{8}{13}-1\right)=-2\cdot\dfrac{7}{19}=-\dfrac{14}{19}\)
5: \(=\dfrac{2}{7}\left(\dfrac{4}{23}-\dfrac{27}{23}+1\right)=0\)
6: \(=\dfrac{3}{8}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\dfrac{11}{8}=\dfrac{3}{8}+\dfrac{11}{8}=\dfrac{14}{8}=\dfrac{7}{4}\)