a, \(\dfrac{20}{15}=\dfrac{4}{3}\)

b, \(\dfrac{6}{15}=\dfrac{2}{5}\)

c, \(\dfrac{42}{30}=\dfrac{7}{5}\)

d, \(\dfrac{40}{35}=\dfrac{8}{7}\)

e, \(\dfrac{42}{42}=1\)

g, \(\dfrac{54}{10}=\dfrac{27}{5}\)

h, \(\dfrac{12}{15}\)

k đúng để nhận câu trả lời
 

giúp em tui với

10

\(\dfrac{23}{6}\)

\(\dfrac{3}{4}\)

\(\dfrac{9}{70}\)

6 x5/3=10   7:8/4+1/3=23/6     2x5/8-1/2=3/4   3/7:5/6x1/4=9/70

=(30+7-37)x(1+2+3+4+5+6+7+8+9+10)

=(37-37)x(1+2+3+4+5+6+7+8+9+10)

=0x(1+2+3+4+5+6+7+8+9+10)

=0

0  đúng đó tich nha

( 6 x 5 + 7 - 37 ) x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )

= ( 30 + 7 - 37 ) x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )

= ( 37 - 37 ) x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )

= 0 x ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 )

= 0

6*5+7-37= 0  vì 0 nhân số nào cũng =0 nên đáp án = 0

=(30+7-37)*(1+2+3+4+5+6+7+8+9+10)

=0*(1+2+3+4+5+6+7+8+9+10)

=0

( 6 x 5  + 7 - 37)x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 +9 + 10)

0 x 55 = 0

a: =9/11(7/4+5/4)=9/11x3=27/11

b: \(=\dfrac{28}{5}\cdot\dfrac{5}{8}\cdot\dfrac{5}{4}=\dfrac{28}{8}\cdot\dfrac{5}{4}=\dfrac{140}{32}=\dfrac{35}{8}\)

c: \(=\dfrac{2}{6}+\dfrac{4}{5}\cdot\dfrac{6}{5}-\dfrac{2}{5}=\dfrac{67}{75}\)

a,=(7/4+5/4):11/9

=3:11/9

=27/11

b,=28/5.5/4.5/8

=7.5/8

=35/8

c,=1/3+24/25-2/5

=97/75-2/5

=67/75

7/4:11/9+5/4:11/9

=7/4×9/11+5/4×9/11

=9/11×(7/4+5/4)

=9/11×12/4

=9/11×3

=27/11

b)

28/5:4/5×5/8

=28/5×5/4×5/8

=28/4×5/8

=7×5/8

=35/8

c)

2/3×3/6+4/5:5/6−2/5

=2/6+4/5×6/5−2/5

=1/3+24/25−2/5

=(24/25−2/5)+1/3

=14/25+1/3

=67/75

=5x(2+4+6+8)
=5x20
=100

nguyễn thị yến vy            

2x5+4x5+6x5+8x5

= 10 + 20 + 30 + 40

= 100

2*5+4*5+6*5+8*5

= (2+4+6+8)*5

=[(2+8)+(4+6)]*5

=(10+10)*5

=20*5

=100