Question

calculati fractiile:1/2+1/4+1/7+1/14+1/28;2 1/5_(3/5+2/3)-7/30​

Answer 1

Răspuns:

Explicație pas cu pas:

1/2+1/4+1/7+1/14+1/28=14/28+7/28+4/28+2/28+1/28=28/28=1

2 1/5-(3/5+2/3)-7/30=11/5-(9/15+10/15)-7/30=11/5-19/15-7/30=66/30-38/30-7/30=28/30-7/30=21/30=7/10