Question

Tính

a. 7,2 : 2 x 58,6 + 2,93 x 2 x 64

b. 4/2/5 + 2/3/7 - 2/2/5 + 5/4/7  (hỗn số)

c. 2 x 41 x 36 +8 x 9 x 58 + 12 x 6

d. 3/5 x 1/2 : 2/5 

e . 1/1/3 x 4/7 + 1/1/3 x 3/7

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Answer 1

a.7,2 :2 x 58,6 + 2,93 x 2 x 64

= 3,6 x 58,6 + 5,86 x 64

=210,96 + 357,04

=586

b.\(4\frac{2}{5}+2\frac{3}{7}-2\frac{2}{5}+5\frac{4}{7}\)

=\(\left(4\frac{2}{5}-2\frac{2}{5}\right)+\left(2\frac{3}{7}+5\frac{4}{7}\right)\)

= 2 + 8

= 10

c. 2 x 41 x 36 + 8 x 9 x 58 + 12 x 6

=72 x 41 + 72 x 58 + 72 x 1

=72 x ( 41 + 58 +1 )

=72 x 100

=7200

d, \(\frac{3}{5}\)x \(\frac{1}{2}\):\(\frac{2}{5}\)

=\(\frac{3}{5}\)x \(\frac{1}{2}\)x\(\frac{5}{2}\)

=\(\frac{3}{4}\)