Question

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tìm x , biết

1) x : 2 1/3 = -1,5 4) x - 15% = 1/3

2) 2,5 . x = 11/15 5) ( 3/7x + 1 ) : ( -4 1/7 )

3) 30%x = -1,2 6) x - 35%x = 1/25

chú ý : / là phần nha

Answer 1

[Nguyễn Lê Phước Thịnh]

1: =>x:7/3=-3/2

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

2: \(x=\dfrac{11}{15}:\dfrac{2}{5}=\dfrac{11}{15}\cdot\dfrac{5}{2}=\dfrac{55}{30}=\dfrac{11}{6}\)

3: \(x=-\dfrac{6}{5}:\dfrac{3}{10}=\dfrac{-6}{5}\cdot\dfrac{10}{3}=\dfrac{-60}{15}=-4\)

4: \(x=\dfrac{1}{3}+\dfrac{3}{20}=\dfrac{20+9}{60}=\dfrac{29}{60}\)

6: \(\Leftrightarrow x\cdot\dfrac{13}{20}=\dfrac{5}{4}\)

hay \(x=\dfrac{5}{4}:\dfrac{13}{20}=\dfrac{5}{4}\cdot\dfrac{20}{13}=\dfrac{100}{52}=\dfrac{25}{13}\)