(17/2+1/2+1).3/5

=10.3/5

=6

hong ai giúp mik dọ? ;-;

giúp mình với

bạn đổi ra số thập phân rồi làm đi

9/15 x 5/9 - 3/5 x 2/9 + 3/5

= 1/3 - 2/15 + 3/5

= 1/5 + 3/5

= 4/5

2/3×3/4×4/5÷1/5=2

2/5×3/4×5/6÷3/4=0.33333333333......

2/3 x 3/4 x 4/5 : 1/5 = 6/12 x 4/5 :1/5 = 24/60 :1/5 = 4/10 : 1/5 = 4/10 x 5/1 = 20/10 = 2

2/5 x 3/4 x 5/6 : 3/4 = 6/20 x 5/6 : 3/4 = 3/10 x 5/6  : 3/4 = 15/60 : 3/4 = 1/4 : 3/4 = 1/4 x 4/3 = 4/12 = 1/3

k cho mk nha!

\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\div\frac{1}{5}\)

\(=\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times\frac{5}{1}\)

\(=\frac{2\times3\times4\times5}{3\times4\times5\times1}\)

\(=\frac{2}{1}\)

\(=2\)

\(\frac{3}{4}\times\frac{2}{5}+\frac{3}{4}\times\frac{3}{5}\)

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

\(=\frac{3}{4}\times1\)

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

3/4 nhé bạn

  \(\frac{3}{4}\times\frac{2}{5}+\frac{3}{4}\times\frac{3}{5}\)

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

\(=\frac{3}{4}\times1\)

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

`3/7xx14/5+32/5xx3/7+3/7xx9/5`

`=3/7xx(14/5+32/5+9/5)`

`=3/7xx55/5`

`=3/7xx5`

`=15/7`

\(=\frac{3}{7}\times[\frac{14}{5}+\frac{32}{5}+\frac{9}{5}]=\frac{3}{7}\times\frac{55}{5}=\frac{3}{7}\times11=\frac{33}{7}\)

2/5 x 3 + 2/5 x 6 + 2/5

= 2/5 x (3+6+1)

=2/5 x 10

= 20/5=4

`2/5 xx 3 + 2/5 xx 6 +2/5`

`= 2/5 xx 3 + 2/5 xx 6 +2/5 xx1`

`= 2/5xx(3+6+1)`

`= 2/5 xx 10`

`= 20/5`

`=4`

2/5 x 3+2/5x6+2/5

=2/5x\(\left(3+6\right)\)+2/5

=2/5x9+2/5

=2/5x\(\left(9+1\right)\)

=2/5x10

=4

Trả lời :

\(10-\frac{3}{8}\times\frac{1}{5}-\frac{3}{8}\times\frac{4}{5}\)

\(=10-\left(\frac{3}{8}\times\frac{1}{5}+\frac{3}{8}\times\frac{4}{5}\right)\)

\(=10-\frac{3}{8}\)

\(=\frac{77}{8}\)

10 -3/8 x 1/5 -3/8 x 4/5

=10-3/8x (1/5-4/5)

=10 - 3/8 x (-3/5)

=10 - (-9/40)

=10 + 9/40 

=40/40 + 9/40

=49/40

chúc bn học tốt