Đáp án+Giải thích các bước giải:
a,2 . ($\frac{7}{2}$ + $\frac{1}{101}$) + $\frac{5}{12}$ - (14 - $\frac{2}{101}$)
= 2 . ($\frac{707}{202}$ + $\frac{2}{202}$ + $\frac{5}{12}$ - ($\frac{1414}{101}$ - $\frac{2}{101}$)
= 2 . $\frac{709}{202}$ + $\frac{5}{12}$ - $\frac{1412}{101}$
= $\frac{1418}{202}$ + $\frac{-16439}{1212}$
= $\frac{8508}{1212}$ + $\frac{-16439}{1212}$
= $\frac{-7931}{1212}$
b, $\frac{3}{5}$ × $\frac{19}{13}$ - $\frac{3}{5}$ × $\frac{6}{13}$ - $\frac{13}{5}$
= $\frac{3}{5}$ × ($\frac{19}{13}$ - $\frac{6}{13}$) - $\frac{13}{5}$
= $\frac{3}{5}$ × 1 - $\frac{13}{5}$
= $\frac{3}{5}$ - $\frac{13}{5}$
= $\frac{-10}{5}$
= -2
Xin lỗi bn phần a mik ko tính nhanh đc
