Question

Bài 1: Tìm x biết:

a, | x-1,7| + 1/2 = 23

b, |x + 4/15| - |3,75|= - | 2,15|

c, | x-3,5| = |4,5-2x|

d, | -2x|= |3+x|

e,|x+4| = -3x + 5

Mọi người giải hộ mình với ạ! Mình đang cần!Thanks

Answer 1

a) \(\left|x-1,7\right|+\dfrac{1}{2}=23\)

\(\left|x-1,7\right|=22,5\)

\(\Rightarrow x-1,7=\pm22,5\)

\(\Rightarrow x=\left\{24,2;-20,8\right\}\)

Answer 2

b) \(\left|x+\dfrac{4}{15}\right|-\left|3,75\right|=-\left|2,15\right|\)

\(\left|x+\dfrac{4}{15}\right|-3,75=-2,15\)

\(\left|x+\dfrac{4}{15}\right|=-2,15+3,75\)

\(\left|x+\dfrac{4}{15}\right|=1,6\)

\(\Rightarrow x+\dfrac{4}{15}=\pm1,6\)

\(\Rightarrow x=\left\{\dfrac{4}{3};-\dfrac{28}{15}\right\}\)