tính nhanh 37,5×6+37,5×4 28+30+70+72+16+84 2/10+4/5+6/7+8/7

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1. $37,5$ x $6+37,5×4$

   $=37,5$ x $(6+4)$

   $=37,5$ x $10$

   $=375$

   $28+30+70+72+16+84$

   $=(28+72)+(30+70)+(16+84)$

   $=100+100+100$

   $=300$

   $\frac{2}{10}+$ $\frac{4}{5}+$ $\frac{6}{7}+$ $\frac{8}{7}$

   $=(\frac{2}{10}+$ $\frac{4}{5})+$ $(\frac{6}{7}+$ $\frac{8}{7})$

   $=(\frac{2}{10}+$ $\frac{8}{10})+$ $\frac{14}{7}$

   $=\frac{10}{10}+2$

   $=1+2$

   $=3$ 

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2. a) 37,5 x 6 + 37,5 x 4

   = 37,5 x (6 + 4)

   = 37,5 x 10

   = 375

   b) 28 + 30 + 70 + 72 + 16 + 84

   = (28 + 72) + (30 +70) + (16 + 84)

   = 100 + 100 + 100

   = 300

   c) 2/10 + 4/5 + 6/7 + 8/7 

   = (2/10 + 4/5) + (6/7 + 8/7)

   = 1 + 2

   = 3

    

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