Question

(7- 3 8/9 - 3/7) : 3 1/9 - 4 5/7=
По действиям! Прошу, помогите!

Answer 1

$(7-3frac{8}{9}-frac{3}{7}):3frac{1}{9}-4frac{5}{7} = \\1) 7-3frac{8}{9} = 3frac{1}{9}\\2) 3frac{1}{9} - frac{3}{7} = 3frac{7}{63} - frac{27}{63} = 2frac{70}{63} - frac{27}{63} = 2frac{43}{63}\\3) 2frac{43}{63} : 3frac{1}{9} = frac{169}{63} : frac{28}{9} = frac{169*9}{63*28} = frac{169}{7*28} = frac{169}{196}$

$4) frac{169}{196} - 4frac{5}{7} = frac{169}{196} - 4frac{140}{196} = -(4frac{140}{196} - frac{169}{196}) = -(3frac{336}{196} - frac{169}{196}) = -3frac{167}{196}$

Ответ: $-3frac{167}{196}$