Question

tính bằng cách thuận tiện nhất:

a,7/4 x 11/21 + 11/21 x 5/4

b,23/14 x 6/13 -9/14 x 6/13

Answer 1

a, = \(\frac{11}{21}\)x \(\left(\frac{7}{4}+\frac{5}{4}\right)\)

   = \(\frac{11}{21}\)x 3

  = \(\frac{33}{21}\)

b) = \(\left(\frac{23}{14}-\frac{9}{14}\right)\)x \(\frac{6}{13}\)

    = 1 x \(\frac{6}{13}\)

    = \(\frac{6}{13}\)

Answer 2

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Answer 3

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Answer 4

Tính bằng cách thuận tiện 18/11×4/5-4/5×7/11+3/4×8/15