Đáp án:
Giải thích các bước giải:
* ĐỀ 10 :
BÀI 1 :
1) 11 $\frac{3}{4}$ - ( 2$\frac{4}{7}$ + 5$\frac{3}{13}$ )
= 11 $\frac{3}{4}$ - 2$\frac{4}{7}$ - 5$\frac{3}{13}$
= ( 11 $\frac{3}{4}$ - 5$\frac{3}{13}$ ) - 2$\frac{4}{7}$
= 6 - 2$\frac{4}{7}$
= 6- $\frac{18}{7}$
= $\frac{42}{7}$ - $\frac{18}{7}$
= $\frac{24}{7}$
BÀI 2 :
$\frac{4}{7}$ + $\frac{5}{6}$ : 5 - 0,375 x $(-2)^{2}$
= $\frac{4}{7}$ + $\frac{1}{6}$ - $\frac{3}{8}$ x 4
= $\frac{4}{7}$ + $\frac{1}{6}$ - $\frac{3}{2}$
= $\frac{4}{7}$ + $\frac{1}{6}$ - $\frac{9}{6}$
= $\frac{4}{7}$ + $\frac{-8}{6}$
= $\frac{4}{7}$ + $\frac{-4}{3}$
= $\frac{12}{21}$ + $\frac{-28}{21}$
= $\frac{-16}{21}$
