\(\frac{57}{76}=\frac{306}{y-15}\)

\(\Rightarrow57\times\left(y-15\right)=76\times306\)

\(\Rightarrow57\times\left(y-15\right)=23256\)

\(\Rightarrow y-15=23256:57\)

\(\Rightarrow y-15=408\)

\(\Rightarrow y=408+15\)

\(\Rightarrow y=423\)

Vậy \(y=423\)

y=430,2857143

các bn giải đầy đủ hết ra nhé , thanks

\(\frac{57}{76}=\frac{306}{y-15}\)

y = 306 : 57 x 76 + 15

y = 423.

<=>57x(y-15)=76x306

<=>57x(y-15)=23256

<=>y-15=23256:57

<=>y-15=408

<=>y=408+15

<=>y=423

A)ta thấy:

1-\(\dfrac{47}{57}\)=\(\dfrac{10}{57}\)

1-\(\dfrac{66}{76}\)=\(\dfrac{10}{76}\)

vì \(\dfrac{10}{57}\)>\(\dfrac{10}{76}\) nên \(\dfrac{47}{57}\)<\(\dfrac{66}{76}\)

\(x+13=32-76\)

\(\Leftrightarrow x+13=-44\)

\(\Leftrightarrow x=-44-13\)

\(\Leftrightarrow x=-57\)

\(-15+x=-14-\left(-57\right)\)

\(\Leftrightarrow-15+x=-14+57\)

\(\Leftrightarrow-15+x=43\)

\(\Leftrightarrow x=43+15=58\)

A) x + 13 = 32 - 76

x + 13= -44

x = (-44) - 13

x = -57

Vậy x = -57

B) (-15) + x = (-14) - (-57)

(-15) + x = (-14) + 57

(-15) + x = 43

x = 43 + (-15)

x = 43 - 15

x = 28

Vậy x = 18

=))

a) x+13 = 32 -76

x+13 = -44

x = -44 -13

x = -57

=> x = -57

b) (-15)+x = (-14)-(-57)

(-15) +x = 43

x = 43 -(-15)

x =58

=> x = 58

tic nhé 

a) x+13=32-76

x+13=-44

x=(-44)-13

x=-57

b)(-15)+x=(-14)-(-57)

(-15)+x=43

x=43-(-15)

x=58

1. =

2. >

3. =

15 + 15 = 15 x 2

57-17 > 76-69

100+78 = 189 - 11

k hộ mik nhé ^^

điền dấu thích hợp 

15 + 15 = 15 x 2

     30            30

57-17 > 76-69

    40          7

100+78 = 189 - 11

     178         178

57 x 76 + 13 x 57 + 11 x 57

= 57 x ( 76 + 11 + 13 )

= 57 x 100

= 5700

57 x 76 + 13 x 57 + 11 x 57

=  57 ( 76 + 13 + 11 )

= 57 x 100

= 5700

57x76+13x57+11x57

=57x(76+13+11)

=57x100

=5700