Question

Tính nhanh:

 49,35 - 20,18 - 12,17

0,25 x 3,6 x 0,4 : 6

\(\frac{144\times18}{84\times27}\)

Answer 1

49.35 - 20.18 - 12.17

= 29.17 - 12.17

= 17

0.25 x 3.6 x 0.4 : 6

= 0.9 x 0.4 : 6

= 0.36 : 6

= 0.06

\(\frac{144x18}{84x27}\)

= \(\frac{8}{7}\)

Answer 2

=49,35-32.35=17

(0.25x0.4)x(3.6:6)=0.1x0.6=0.06

\(\frac{2x2x2x2x3x3x3x3x3}{2x2x3x7x3x3x3}=\frac{2x2x3}{7}=\frac{12}{7}=15_7\)

Answer 3

ý câu cuối là 1 và 5/7