Question

[๖ۣۜƤøɱ Ğøøɗ Ğїɾℓッ]

Bài 1:Tìm số nguyên x, biết:

Bỏ ngoặc rồi tìm x.

a) x-8-(12-2x)= -20

b) -27+(x+8)-(+11)=2

c) -2x-16=2-(3x+9)

Answer 1

[Huỳnh Quang Sang]

a) x - 8 - (12 - 2x) = -20

=> x - 8 - 12 + 2x = -20

=> (x + 2x) + (-8 - 12) = -20

=> 3x - 20 = -20

=> 3x = 0 => x = 0

b) -27 + (x + 8) - ( +11) = 2

=> -27 + x + 8 - 11 = 2

=> -27 + x = 2 + 11 - 8

=> -27 + x = 5

=> x = 5 - (-27) = 32

c) -2x - 16 = -2 - (3x + 9)

=> -2x - 16 = -2 - 3x - 9

=> -2x - 16 + 2 + 3x + 9 = 0

=> (-2x + 3x) + (-16 + 2 + 9) = 0

=> x - 5 = 0

=> x = 5

Answer 2

[乡☪ɦαทɦ💥☪ɦųα✔]

\(a,x-8-\left(12-2x\right)=-20\)

\(x-8-12+2x=-20\)

\(x+2x-8-12=-20\)

\(3x-20=-20\)

\(3x=-20+20\)

\(3x=0\)

\(x=0\)

\(b,-27+\left(x+8\right)-\left(+11\right)=2\)

\(-27+x+8-11=2\)

\(x-27+8-11=2\)

\(x-30=2\)

\(x=2+30\)

\(x=32\)

\(c,-2x-16=2-\left(3x+9\right)\)

\(-2x-16=2-3x-9\)

\(-2x+3x=2-9+16\)

\(x=9\)

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