Question

Помогите только 12 задания

Answer 1

а) $7 frac{16}{35} -( 3frac{11}{35}+ 4frac{1}{56} )=0,125$

$1) 3frac{11}{35} + 4frac{1}{56} = frac{116}{35} +frac{225}{56} = frac{8*116+5*225}{280}= frac{928+1125}{280}= frac{2053}{280}$

$2)7 frac{16}{35} - frac{2053}{280} = frac{261}{35} - frac{2053}{280} = frac{2088-2053}{280} = frac{35}{280} = frac{1}{8} =0,125$


$b) 7+ 1 frac{29}{40} +2 frac{17}{30} =11 frac{7}{24}$

$1)7+1 frac{29}{40} = frac{7}{1} + frac{69}{40} = frac{349}{40}$

$2) frac{349}{40} +2 frac{17}{30} = frac{349}{40} + frac{77}{30} = frac{1047+308}{120} = frac{1355}{120}= frac{271}{24} =11 frac{7}{24}$


$c) 8frac{5}{12} + frac{5}{6}-5 frac{3}{4} -2 frac{1}{2} = frac{101}{12} + frac{5}{6} - frac{23}{4} - frac{5}{2} = frac{101+2*5-3*23-6*5}{12} = frac{12}{12} =1$