Question

найдите значение 2/5+4/15;1/3+1/4;2/3-2/5;1/5-1/6;1/2+1/4.

Answer 1

2/5+4/15=6/15+4/15=10/15=2/3
1/3+1/4=4/12+3/12=7/12
2/3-2/5=10/15-6/15=4/15
1/5-1/6=6/30-5/30=1/30
1/2+1/4=2/4+1/4=3/4=0,75

Answer 2

$1)frac{2}{5}+ frac{4}{15}= frac{6+4}{15}= frac{10}{15}= frac{2}{3} \ \ 2) frac{1}{3}+ frac{1}{4}= frac{4+3}{12}= frac{7}{12} \ \ 3) frac{2}{3}- frac{2}{5}= frac{10-6}{15}= frac{4}{15} \ \ 4) frac{1}{5}- frac{1}{6}= frac{6-5}{30}= frac{1}{30} \ \ 5) frac{1}{2}+ frac{1}{4}= frac{4+2}{8}= frac{6}{8}= frac{3}{4}$