B = \(\frac{5}{2.1}+\frac{4}{1.11}+\frac{3}{11.2}+\frac{1}{2.15}+\frac{13}{15.4}\)
B = \(7.\left(\frac{5}{2.7}+\frac{4}{7.11}+\frac{3}{11.14}+\frac{1}{14.15}+\frac{13}{15.28}\right)\)
B = \(7.\left(\frac{1}{2}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-\frac{1}{14}+\frac{1}{14}-\frac{1}{15}+\frac{1}{15}-\frac{1}{28}\right)\)
B = \(7.\left(\frac{1}{2}-\frac{1}{28}\right)\)
B = \(7.\frac{13}{28}\)
B = \(\frac{13}{4}\)
cho mình hỏi viết phân số kiểu gì zợ?
B = 7 . ( \(\frac{1}{2}-\frac{1}{28}\))
B = 7. \(\frac{13}{28}\)
B = \(\frac{13}{4}\)
câu trả lời chính xác nhất là 13/4 bạn a
Đáp số là \(\frac{13}{4}\) bạn nhé
\(B=7.\left(\frac{1}{2}-\frac{1}{28}\right)\)
\(B=7.\frac{13}{28}\)
\(B=\frac{13}{4}\)
\(K-MK-NHA\)
B=5/2.1+4/1.11+3/11.2+1/2.15+13/15.4
=>7B=7.(5/2.1+4/1.11+3/11.2+1/2.15+13/15.4)
=5/2.7+4/7.11+3/11.14+1/14.15+13/15.28
=1/2-1/7+1/7-1/11+1/11-1/14+1/14-1/15+1/15-1/28
=1/2-1/28
=13/28