sửa đề: \(\left(4-\frac{1}{23}-\frac{56}{39}-\frac{25}{47}\right):\left(\frac{5}{69}+\frac{5}{117}+\frac{5}{141}\right)\)

\(=\left(1-\frac{1}{23}+2-\frac{56}{39}+1-\frac{25}{47}\right):\left(\frac{5}{69}+\frac{5}{117}+\frac{5}{141}\right)\)

\(=\left(\frac{22}{23}+\frac{22}{39}+\frac{22}{47}\right):\left(\frac{5}{69}+\frac{5}{117}+\frac{5}{141}\right)\)

\(=\frac{22\left(\frac{1}{23}+\frac{1}{39}+\frac{1}{47}\right)}{\frac53\left(\frac{1}{23}+\frac{1}{39}+\frac{1}{47}\right)}\)

\(=22:\frac53=22\cdot\frac35=\frac{66}{5}\)

sửa đề: \(\left(4-\frac{1}{23}-\frac{56}{39}-\frac{25}{47}\right):\left(\frac{5}{69}+\frac{5}{117}+\frac{5}{141}\right)\)

\(=\left(1-\frac{1}{23}+2-\frac{56}{39}+1-\frac{25}{47}\right):\left(\frac{5}{69}+\frac{5}{117}+\frac{5}{141}\right)\)

\(=\left(\frac{22}{23}+\frac{22}{39}+\frac{22}{47}\right):\left(\frac{5}{69}+\frac{5}{117}+\frac{5}{141}\right)\)

\(=\frac{22\left(\frac{1}{23}+\frac{1}{39}+\frac{1}{47}\right)}{\frac53\left(\frac{1}{23}+\frac{1}{39}+\frac{1}{47}\right)}\)

\(=22:\frac53=22\cdot\frac35=\frac{66}{5}\)

các bạn nhanh lên, mình cần gấp lắm

\(\frac{4-\frac{3}{69}-\frac{168}{117}-\frac{75}{141}}{\frac{5}{69}+\frac{5}{117}+\frac{5}{141}}\)

=\(\frac{\frac{66}{69}-\frac{66}{117}-\frac{66}{141}}{\frac{5}{69}+\frac{5}{117}+\frac{5}{141}}\)

=\(\frac{66\left(\frac{1}{69}+\frac{1}{117}+\frac{1}{141}\right)}{5\left(\frac{1}{69}+\frac{1}{117}+\frac{1}{141}\right)}\)

=\(\frac{66}{5}\)

=-117-[-117+15]

=-117-[-(117-15)]

=-117-(-102)

=-117+102

=-(117-102)

=-15

k cho minh nha

Tìm tập hợp A các bội chung nhỏ hơn 300 của 20&24

a) 

5 8 x + 2 5 = 1 5 5 8 x             = 1 5 − 2 5 5 8 x            = − 1 5 x               = − 1 5 : 5 8 x                = − 1 5 . 8 5 x               = − 8 25

b)

5 7 : x + 11 7 = 18 7 5 7 : x            = 18 7 − 11 7 5 7 : x             = 1 x                 = 5 7 : 1 x                = 5 7

c)

2 x 5 − 1 : − 5 = 1 7 2 x 5 − 1         = 1 7 . − 5 2 x 5 − 1       = − 5 7 2 x 5              = − 5 7 + 1 2 x 5              = 2 5 x                 = 2 5 : 2 5 x                 = 1