( 1/6 + 1/10 - 1/15) + x = 0
1/5 + x =0
x = -1/5
2) => \(-\frac{5}{42}-x=-\frac{18}{28}\) => \(-x=\frac{5}{42}-\frac{18}{28}=\frac{10}{84}-\frac{54}{84}=-\frac{44}{84}\)
=> \(x=\frac{44}{84}=\frac{11}{21}\)
3) => \(x=-\left(\frac{1}{6}+\frac{1}{10}-\frac{1}{15}\right)=-\left(\frac{10}{60}+\frac{6}{60}-\frac{4}{60}\right)=-\frac{12}{60}=-\frac{1}{5}\)
4) => \(\frac{x}{5}=\frac{2}{10}-\frac{1}{5}-\frac{7}{50}=\frac{1}{5}-\frac{1}{5}-\frac{7}{50}=-\frac{7}{50}\)
=> \(x=5.\frac{-7}{50}=-\frac{7}{10}\)
1)x-2/7=8/21
x=8/21+2/7=8/21+6/21=14/21
2)11/13-(5/42+x)=-18/28+11/16
=>-5/42-x=-18/28
x=-5/42-(-18/28)=-10/84+54/84=44/84=11/21
3)(1/6+1/10-1/15)+x=0
(5/30+3/30-2/15)+x=0
6/15+x=0
x=0-6/15
x=-6/15
4)-(-x)/5-2/10=-1/5-7/50
x/5-2/10=-10/50-7/50
x/5-2/10=-17/50
x/5=-17/50+2/10=-17/50+10/50
x/5=-7/50
=>10x/5=-7/50
10x=-7
x=-7/10
mk ko chắc đâu, tính nhẩm, có j tính lại nha
Xin lỗi chị ạ em không bít bài này vì em mới học lớp 6 thui ạ. I sorry