Question

Bài 1: 

a, (x + 1,5) : 3\(\dfrac{1}{5}\)=\(\dfrac{-5}{8}\)

b, (8\(\dfrac{4}{5}\) x - 50) : 0,4 = 51

Answer 1

a: \(\left(x+1,5\right):3\dfrac{1}{5}=-\dfrac{5}{8}\)

=>\(\left(x+1,5\right):\dfrac{16}{5}=-\dfrac{5}{8}\)

=>\(x+\dfrac{3}{2}=-\dfrac{5}{8}\cdot\dfrac{16}{5}=\dfrac{-16}{8}=-2\)

=>\(x=-2-\dfrac{3}{2}=-\dfrac{7}{2}\)

b: \(\left(8\dfrac{4}{5}x-50\right):0,4=51\)

=>\(8,8x-50=0,4\cdot51=20,4\)

=>\(8,8x=20,4+50=70,4\)

=>\(x=\dfrac{70.4}{8.8}=8\)