Question

[Linh Linh]

Tinhs giá trị biểu thức ::

a) 8,3 x 39 - 2,93 x 500 + 19,3 x 20

b) \(3\frac{3}{2}\times\frac{3}{17}+\frac{4}{9}\times\frac{27}{8}-\frac{1}{3}\)

c)9,31 : 6 + 13,8 : 6 -5,11 : 6

d) \(\frac{19,8\div0,2\times44,44\div0,5\times13,2\div0,25}{3,3\times88,88\div0,5\times6,6\div0,125\times5}\)

e) \(\frac{5}{1.6}+\frac{5}{6.11}+...+\frac{5}{501.506}\)

f) \(\frac{\frac{4}{7}+\frac{12}{13}+\frac{16}{17}-\frac{8}{27}}{\frac{5}{21}+\frac{15}{39}+\frac{20}{51}-\frac{10}{81}}\)

Answer 1

[✎✰ ๖ۣۜCoɗσηquα༣✰✍]

\(\frac{5}{1.6}\)+ \(\frac{5}{6.11}\)+ .........+\(\frac{5}{501.506}\)

=\(\frac{1}{1.6}+\frac{1}{6.11}+.....+\frac{1}{501.506}\)

=\(\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+......+\frac{1}{501}-\frac{1}{506}\)

=\(\frac{1}{1}-\frac{1}{506}\)

= tự tính nha

Answer 2

[Rinu]

Giải

Làm thử thoi nhoa !

a)8,3.39-2,93.500+19,8.20

=323,7-1465+396

=323,7+396-1465

=719,7-1456

=-745,3