Question

a . x + 5 = - 10

b. x - ( - 10 ) = 5

c. / x / - 5 = 3

d. 15 - ( - x ) = 20

e . / x - 4 / = 3 - ( - 7 )

f. / x + 5 / = 10 - ( - 20 )

Answer 1

\(a.\)

\(x+5=-10\)

\(\Rightarrow x=-10-5=-15\)

 

Answer 2

a ) x +5 = -10

x = -10 -5

x = - 15

b) x - ( - 10 ) = 5

x = 5+(-10)

x = -5

c) \(\left|x\right|\) -5 = 3

\(\left|x\right|=8\)

x ϵ { -8 ; 8 }

d) 15 - ( - x ) = 20

Không có số tự nhiên x nào mà 15 ( - x ) = 20

e ) \(\left|x-4\right|=3-\left(-7\right)\\ \left|x-4\right|=10\\ \left|x\right|=14\\ x\in\left\{\pm14\right\}\)

f ) \(\left|x+5\right|=10-\left(-20\right)\\ \left|x+5\right|=30\\ \left|x\right|=25\\ x\in\left\{\pm25\right\}\)

 

 

Answer 3

\(b.\)

\(x-\left(-10\right)=5\)

\(\Rightarrow x+10=5\)

\(\Rightarrow x=5-10=-5\)

Answer 4

\(c.\)

\(\left|x\right|-5=3\)

\(\Rightarrow\left|x\right|=3+5=8\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=-8\\x=8\end{array}\right.\)

Answer 5

\(d.\)

\(15-\left(-x\right)=20\)

\(\Rightarrow15+x=20\)

\(\Rightarrow x=20-15=5\)

Answer 6

\(e.\)

\(\left|x-4\right|=3-\left(-7\right)\)

\(\Rightarrow\left|x-4\right|=10\)

\(\Rightarrow\left[\begin{array}{nghiempt}x-4=10\\x-4=-10\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=10+4=14\\x=-10+4=-6\end{array}\right.\)

Answer 7

\(f.\)

\(\left|x+5\right|=10-\left(-20\right)\)

\(\Rightarrow\left|x+5\right|=30\)

\(\Rightarrow\left[\begin{array}{nghiempt}x+5=30\\x+5=-30\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=30-5=25\\x=-30-5=-35\end{array}\right.\)

Answer 8

a,

\(x+5=-10\)

\(x=\left(-10\right)-5\)

\(x=-15\)

b,

\(x-\left(-10\right)=5\)

\(x=5+\left(-10\right)\)

\(x=-5\)

c,

\(\left|x\right|-5=3\)

\(\rightarrow x-5=3\)

\(x=3+5\)

\(x=8\)

d,

\(15-\left(-x\right)=20\)

\(\left(-x\right)=15-20\)

\(\left(-x\right)=-5\)

\(\rightarrow x=5\)

Làm tương tự nhé bạn.