= 4(25 + 32 + 39 + 46 + 53)

= 4 . 195

= 780

k giùm

=4(25+32+39+46+53)

=780

= 4.(25+32+46+39+53)

=4.195

= 780

4.25+4.32+4.39+4.46+4.53

=4.(25+32+39+46+53)

=4.195

=780

= 4.(25 + 32 + 39 + 46 + 53)

= 4.195=780

=4.(25+32+39+46+53)

=4.195

=780

DỄ MÀ BN!!!!!!

a}14779

b]70056

c]80680

d]89586

a) 9985

b) 21.95

\(\left(\dfrac{2}{7}+\dfrac{5}{7}\right)+\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\left(\dfrac{3}{8}+\dfrac{4}{8}+\dfrac{1}{8}\right)+\left(\dfrac{1}{9}+\dfrac{8}{9}\right)=1+1+1+1=4\)

(2/7 + 5/7) + (3/5 + 2/5) + (3/8 + 4/8 + 1/8) + (1/9 + 8/9 )

= 1  +       1                   +         1             +        1         =  4

(3/5+2/5)+(3/4+1/2)+5/8

=1+1+5/8

=2,6

= (3/5 + 2/5) + (3/4 + 1/2)

=         1         +       5/4

=                   9/4

ko biết có cần đổi ra số thập phân hay ko?

3/5+3/4+2/5+5/8+1/2

= 3/5+2/5 - 5/8+1/2+3/4

= 1 - 5/8 + 4/8+6/8

= 8/8-5/8+4/8+6/8

= 3/8+4/8+6/8

= 7/8+6/8

=13/8

\(5\dfrac{3}{4}:3+2\dfrac{1}{4}\times\dfrac{1}{3}-\dfrac{1}{8}=\left(5\dfrac{3}{4}+2\dfrac{1}{4}\right)\times\dfrac{1}{3}-\dfrac{1}{8}\\ =8\times\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{8}{3}-\dfrac{1}{8}=\dfrac{61}{24}\\ ----\\ \dfrac{3}{5}:\dfrac{5}{6}:\dfrac{6}{7}:\dfrac{7}{8}+\dfrac{2}{5}+\dfrac{23}{35}\\ =\dfrac{3}{5}\times\dfrac{6}{5}\times\dfrac{7}{6}\times\dfrac{8}{7}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{18}{25}\times\dfrac{4}{3}+\dfrac{2}{5}+\dfrac{23}{35}=\dfrac{353}{175}\)

Tham khảo nhé bạn :))

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