1.tìm x biết
a) x:8=7:4
d) 2,5:7,5= x:\(\frac{7}{9}\)
h) \(2\frac{2}{3}:x=1\frac{7}{9}:0,02\)
b) (x+1):0,75=1,4:0,25
e) \(\frac{x-1}{x-5}=\frac{6}{7}\)
f) \(\frac{x^2}{6}=\frac{24}{25}\)
c) \(\frac{x+2}{5}=\frac{1}{x-2}\)
g) \(\frac{3}{x-4}=\frac{x+4}{3}\)
i) \(\frac{x+2}{x+6}=\frac{3}{x+1}\)
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Đọc tiếp
1.tìm x biết
| a) x:8=7:4 | d) 2,5:7,5= x:\(\frac{7}{9}\) | h) \(2\frac{2}{3}:x=1\frac{7}{9}:0,02\) |
| b) (x+1):0,75=1,4:0,25 | e) \(\frac{x-1}{x-5}=\frac{6}{7}\) | f) \(\frac{x^2}{6}=\frac{24}{25}\) |
| c) \(\frac{x+2}{5}=\frac{1}{x-2}\) | g) \(\frac{3}{x-4}=\frac{x+4}{3}\) | i) \(\frac{x+2}{x+6}=\frac{3}{x+1}\) |
a) \(x:8=7:4\)
=> \(\frac{x}{8}=\frac{7}{4}\)
=> \(x.4=7.8\)
=> \(x.4=56\)
=> \(x=56:4\)
=> \(x=14\)
Vậy \(x=14.\)
b) \(\left(x+1\right):0,75=1,4:0,25\)
=> \(\left(x+1\right):0,75=5,6\)
=> \(\left(x+1\right)=5,6.0,75\)
=> \(x+1=4,2\)
=> \(x=4,2-1\)
=> \(x=3,2\)
Vậy \(x=3,2.\)
Mình chỉ làm 2 câu thôi nhé, bạn đăng nhiều quá.
Chúc bạn học tốt!