Tính:
a, 7/5 + 4/7 - 9/10 = ..................................................................
b, 2 + 3/4 * 8/5 = ......................................................................
c, 9/8 - 6/5 : 8/5 = .....................................................................
d, 6 : 9/7 * 3/10 = ......................................................................
\(a.\frac{7}{5}+\frac{4}{7}-\frac{9}{10}=\frac{98}{70}+\frac{40}{70}-\frac{63}{70}=\frac{98+40-63}{70}=\frac{75}{70}\)\(=\frac{15}{14}\)
\(b.2+\frac{3}{4}x\frac{8}{5}=2+\frac{6}{5}=\frac{16}{5}\)
\(c.\frac{9}{8}-\frac{6}{5}:\frac{8}{5}=\frac{9}{8}-\frac{6}{5}x\frac{5}{8}=\frac{9}{8}-\frac{6}{8}=\frac{3}{8}\)
Mình làm nốt cho bạn câu d
6:9/7x3/10=
6x7/9=42/9x3/10
=42x3(mk k biết ghi dấu gạch dưới bn thông cảm)
= 126/90
=7/5
