Question

[trinh hong phat]

Tính nhanh : 

B=(7/1/3+8/1/5)-(7/1/5+8/1/7-3/1/4)

Answer 1

[Đào Nguyên Cường]

=3/37/84

Answer 2

[Lã Hoàng Hải Linh]

B = ( 7\(\frac{1}{3}\) + 8\(\frac{1}{5}\) ) - ( 7\(\frac{1}{5}\) + 8\(\frac{1}{7}\) - 3\(\frac{1}{4}\) )

B =  ( \(\frac{22}{3}\) + \(\frac{41}{5}\)) - ( \(\frac{36}{5}\) + \(\frac{57}{7}\) - \(\frac{13}{4}\) )

B =           \(\frac{233}{15}\)       -            \(\frac{1693}{140}\)

B =                    \(\frac{289}{84}\)