rút gọn : a, 4.7/9.32 b, -374/506 c, 2.5.13/26.35 d, 9.6-9.3/18 e, 17.5-17/3-20 g, 49-7.49/49 giúp mik nhé

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1. Đáp án:

    

   Giải thích các bước giải:

   a) 4 . $\frac{7}{9}$ . 32 = $\frac{896}{7}$ = 128

   b) $\frac{-374}{506}$ = $\frac{-17}{23}$ 

   c) 2 . 5 .$\frac{13}{26}$ . 35 = 2 . 5 .$\frac{1}{2}$ . 35 = 175

   d) 9 . 6 – 9 . $\frac{3}{18}$ = 9 . 6 – 9 . $\frac{1}{6}$ = 9 . ( 6 – $\frac{1}{6}$ ) = 9 . ( $\frac{36}{6}$ – $\frac{1}{6}$ ) = 9 . $\frac{35}{6}$ = 3 . $\frac{35}{2}$ = $\frac{105}{2}$

   e) 17 . 5 – $\frac{17}{3}$ – 20 = 17 . 5 – 17 . $\frac{1}{3}$ – 20 = 7 . ( 5 – $\frac{1}{3}$ ) – 20 = $\frac{14}{3}$ – 20 = $\frac{14}{3}$ – $\frac{60}{3}$ = $\frac{46}{3}$ 

   g) 49 – 7 . $\frac{49}{49}$ = 49 – 7 . 49 . $\frac{1}{49}$ = 49 – 49 . $\frac{7}{49}$ = 49 – 49 . $\frac{1}{7}$ = 49 . ( 1 – $\frac{1}{7}$ ) = 49 . $\frac{6}{7}$ = 42

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