Giải chi tiết tiết hộ mình nhé

Giúp 

c1 :(5/4 + 2/5) : 5/6 = 33/20 : 5/6 = 99/50 

c2 :(5/4 + 2/5) : 5/6 = 5/4 : 5/6 + 2/5 : 5/6 =99/50

c1 : 3/4 x 2/5 - 3/4 x 2/7 = 3/4 x (2/5 - 2/7) = 3/4 x 4/35 = 3/35

c2 : 3/4 x 2/5 - 3/4 x 2/7 = 3/35

c1 : 2/3 : (5/6 x 9/10) = 2/3 : 3/4 = 8/9

c2 : 2/3 : (5/6 x 9/10) = 5/6 : 2/3 x 9/10 : 2/3 = 27/16 * cái này chx chắc:"> quên mất cách lm;-;"" "

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\(=\left(\dfrac{9}{10}-\dfrac{7}{10}\right)+\left(\dfrac{7}{5}-\dfrac{6}{5}\right)=\dfrac{1}{5}+\dfrac{1}{5}=\dfrac{2}{5}\)

9/10+7/5-7/10-6/5

=( 9/10 - 7/10 ) + ( 7/5 - 6/5)

=1/5 + 1/5

=2/5

( 9/10 - 7/10 ) + ( 7/5 - 6/5 )

= 1/5 + 1/5

= 2/5

Bài làm

     \(5x\frac{10}{20}+\frac{10}{20}x5+2x\frac{10}{20}\)

\(=\frac{10}{20}x\left(5+5+2\right)\)

\(=\frac{10}{20}x12\)

\(=\frac{12}{20}\)

\(=\frac{3}{5}\)

# Chúc bạn học tốt #

5*10/20+10/20*5+2*10/20

=(5+5)*10/20+2*10/20

=10*10/20+2*10/20

=5+1

=6

5 * 10/20 + 10/20 * 5 + 2 * 10/20=\(\frac{10}{20}\left(5+5+2\right)=\frac{10}{20}\cdot12=6\)

Ghi cả cách trình bày nha mọi người

\(a,\dfrac{4}{15}:\dfrac{4}{7}< x< \dfrac{2}{5}\times\dfrac{10}{3}\\ \Leftrightarrow\dfrac{7}{15}< x< \dfrac{4}{3}\\ \Leftrightarrow x=1\)

\(b,\dfrac{3}{5}\times\dfrac{3}{7}+\dfrac{2}{5}\times\dfrac{4}{7}=\dfrac{9}{35}+\dfrac{8}{35}=\dfrac{17}{35}\)

a) \(\dfrac{5}{7}\times\dfrac{5}{9}+\dfrac{4}{9}\times\dfrac{5}{7}\)

\(=\dfrac{5}{7}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)\)

\(=\dfrac{5}{7}\times1\)

\(=\dfrac{5}{7}\)

b) \(\dfrac{1}{10}+\dfrac{5}{9}+\dfrac{4}{9}+\dfrac{9}{10}-1\)

\(=\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\left(\dfrac{1}{10}+\dfrac{9}{10}-1\right)\)

\(=1+0\)

\(=1\)

c) \(\dfrac{5}{7}\times\dfrac{5}{9}+\dfrac{4}{9}\times\dfrac{5}{7}+\dfrac{2}{7}\)

\(=\dfrac{5}{7}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)+\dfrac{2}{7}\)

\(=\dfrac{5}{7}+\dfrac{2}{7}\)

\(=1\)

d) \(\dfrac{2}{7}+\dfrac{2}{8}+\dfrac{1}{4}+\dfrac{1}{7}+\dfrac{4}{7}\)

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

\(=\left(\dfrac{1}{4}+\dfrac{1}{4}\right)+1\)

\(=\dfrac{1}{2}+1\)

\(=\dfrac{3}{2}\)

e) \(\dfrac{4}{5}+\dfrac{3}{10}+\dfrac{2}{10}+0,7\)

\(=\dfrac{4}{5}+\dfrac{5}{10}+\dfrac{7}{10}\)

\(=\dfrac{4}{5}+\dfrac{12}{10}\)

\(=\dfrac{4}{5}+\dfrac{6}{5}\)

\(=\dfrac{10}{5}\)

\(=2\)

g) \(362\times728+326\times272\)

\(=326\times\left(728+272\right)\)

\(=326\times1000\)

\(=326000\) 

A) 5/4 x X = 3/8 + 5/12

5/4 x X = 19/24

        X  = 19/24 : 5/4

        X  = 19/30

vậy x =...

B, 3 x 7/10 + 7/10 x 5 + 2 x 7/10

  = 7/10 x ( 3 + 5 + 2)

  = 7/10 x 10

  = 7

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