Question

timf số nguyên x

17+(x-7)+2.(2x+1)=17

nhanh hộ mình nhá

Answer 1

17 + (x - 7) + 2(2x + 1) = 17

<=> x - 7 + 2(2x + 1) = 17 - 17

<=> x - 7 + 2(2x + 1) = 0

<=> x + 2(2x + 1) = 0 + 7

<=> x + 2(2x + 1) = 7

<=> x + 4x + 1 = 7

<=> 5x + 2 = 7

<=> 5x = 7 - 2

<=> 5x = 5

=> x = 1

Answer 2

\(17+\left(x-7\right)+2\left(2x+1\right)=17\)

\(\Rightarrow x-7+4x+2=0\)

\(\Rightarrow5\left(x-1\right)=0\)

\(\Rightarrow x-1=0\)

\(\Rightarrow x=1\)

Answer 3

\(17+\left(x-7\right)+2\left(2x+1\right)=17\)

\(\Leftrightarrow17+x-7+4x+2=17\)

\(\Leftrightarrow\left(17-7\right)+\left(x+2x\right)+2=17\)

\(\Leftrightarrow10+3x+2=17\)

\(\Leftrightarrow\left(10+2\right)+3x=17\)

\(\Leftrightarrow12+3x=17\)

\(\Leftrightarrow3x=17-12\)

\(\Leftrightarrow3x=5\)

\(\Leftrightarrow x=\frac{5}{3}\)

Answer 4

\(17+\left(x-7\right)+2.\left(2x+1\right)=17\)

\(\Rightarrow17+x-7+4x+2=17\)

\(\Rightarrow x-7+4x+2=17-17\)

\(\Rightarrow x-7+4x+2=0\)

\(\Rightarrow5x-5=0\)

\(\Rightarrow5x=0+5=5\)

\(\Rightarrow x=5:5=1\)

Vậy x = 1