Đáp án:
Giải thích các bước giải:
$M=6,1×3,8+6,1×6,2-5,1×10$
$=6,1×(3,8+6,2)-5,1×10$
$=6,1×10-5,1×10$
$=10×(6,1-5,1)$
$=10×1$
$=10$
$N=5\dfrac{9}{10}:\dfrac{3}{2}-(2\dfrac{1}{3}×4\dfrac{1}{2}-2×\dfrac{21}{3}):\dfrac{7}{4}$
$ $
$=\dfrac{59}{10}×\dfrac{2}{3}-(\dfrac{7}{3}×\dfrac{9}{2}-2×7)×\dfrac{4}{7}$
$ $
$=\dfrac{59}{15}-(\dfrac{21}{2}-14)×\dfrac{4}{7}$
$ $
$=\dfrac{59}{15}+\dfrac{7}{2}×\dfrac{4}{7}$
$ $
$=\dfrac{59}{15}+2$
$ $
$=\dfrac{89}{15}$
