Question

Tìm x biết;

a)15-(4-x)=6

b)-30+(25-x)=-1

c)x-(12-25)=-8

d)(x-29)-(17-38)=-9

Giúp mình nha

Chiều mình nộp rùi

Ai nhanh nhất mình tick cho

Thank you><

Answer 1

a) Ta có: \(15-\left(4-x\right)=6\)

\(\Leftrightarrow15-4+x=6\)

\(\Leftrightarrow11+x=6\)

\(\Leftrightarrow x=-5\)

Vậy: x=-5

b) Ta có: \(-30+\left(25-x\right)=-1\)

\(\Leftrightarrow-30+25-x=-1\)

\(\Leftrightarrow-5-x=-1\)

\(\Leftrightarrow x=-5+1=-4\)

Vậy: x=-4

c) Ta có: \(x-\left(12-25\right)=-8\)

\(\Leftrightarrow x-12+25+8=0\)

\(\Leftrightarrow x+21=0\)

\(\Leftrightarrow x=-21\)

Vậy: x=-21

d) Ta có: \(\left(x-29\right)-\left(17-38\right)=-9\)

\(\Leftrightarrow x-29-17+38+9=0\)

\(\Leftrightarrow x+1=0\)

\(\Leftrightarrow x=-1\)

Vậy: x=-1

Answer 2

a.x-4=15-6 b.25-x=-30-(-1) c.x-(-13)=-8

x-4=9 25-x=-29 x+13=-8

x=9+4 x=25-(-29) x=-8-13

x=13 x=54 x=-21

d.x-29-(-21)=-9

x-29+21=-9

x-29=-9-21

x-29=-30

x=-30+29

x=-1

Answer 3

a/ 15-4+x=6

11+x=6

x=-5

b/-30+25-x=-1

-5-x=-1

-x=4

x=-4

c/x-(-13)=-8

x+13=-8

x=-21

d/x-29-(-21)=-9

x-29+21=-9

x-8=-9

x=-1

Answer 4

a) 15-(4-x)=6

4-x=15-6

4-x=9

x=4-9

x=-5

c) x-(12-25)=-8

x-(-13)=-8

x=-8+(-13)

x=-21

d) (x-29)-(17-38)=-9

x-29+21=-9

x-8=-9

⇒x=-1

b) -30+(25-x)=-1

-30+25-x=-1

-5-x=-1

⇒x=-4

Answer 5

@Hoa Do Nek bn

a) 15-(4-x)=6

⇒15-4+x=6

⇒11+x=6

⇒x=-5

c) x-(12-25)=-8

⇒x+13=-8

⇒x=-21

d) (x-29)-(17-38)=-9

⇒x-29+21=-9

⇒x-8=-9

⇒x=-1

b) -30+(25-x)=-1

⇒-30+25-x=-1

⇒-5-x=-1

⇒x=-4