(-3,75).(-7,2)+2,8.3,75=3,75.(7,2+2,8)

                                =3,75.10

                                =37,5

kb vs mk nhé,đc ko?

=(-3,75)(-7,2-2,8)    

=-3,75.-(10)

=37,5

=37,5

\(\left(-3,75\right).\left(-7,2\right)+2,8.3,75\)

\(=3,75.7,2+2,8.3,75\)

\(=3,75\left(7,2+2,8\right)\)

\(=3,75.10\)

\(=37,5\)

-3,75.(-7,2)+2,8.3,75=3,75.7,2+2,8.3,75=3,75.10=37.5

I'm thanks very much

(-3,75).(-7,2)+2,8.3,75

<=>3,75.7,2+2,8.3,75   (đổi 2 dấu  âm thành dấu  dương)

= 3,75. (7,2+2,8)

=3,75 .10

=37,5

=> 3,75.7,2+2,8.3,75

=3,75(7,2+2,8)

=3,75.10

=37,5

x = 1,5+3,75

x = 5.25

x - 3,75=1,5

x = 1,5 + 3,75

x = 5,25

x = 1,5+3,75

x = 5.25

nha 

\(\dfrac{7011}{25}:\left(x-42.6\right).15=13\)

\(\Rightarrow\dfrac{7011}{\dfrac{25}{\left(x-42,6\right)}}.0,15=13\)

\(\Rightarrow\dfrac{280,44}{\left(x-42,6\right)}.0,15=13\)

\(x-\left(280,44-42,6\right)\)

\(x=237.8+86,7\)

\(x=324,54\)

\(\)Vậy x=324,54

b.

\(7,2-\left(x+3,75:2,1\right):1,9=5,2\)

\(\Rightarrow7,2+\dfrac{-\left(x-\dfrac{3,75}{2,1}\right)}{1,9}=5,2\)

\(7,2+\dfrac{-\left(x-1,8\right)}{1,9}=5,2\)

1.tính 

a,2,25+3,75:1,5 = 4,75

b,10-4,86:1,8 = 7,3

a) \(2,25+3,75:1,5\)
\(=2,25+2,5\)
\(=4,75\)
b) \(10-4,86:1,8\)
\(=10-2,7\)
\(=7,3\)

a) = 4,75

b) = 7,3

\(\left(-3,75\right)\left(-7,2\right)+2,8.3,75=3,75.7,2+2,8.3,75=\dfrac{15}{4}.\dfrac{36}{5}+\dfrac{14}{5}.\dfrac{15}{4}=\dfrac{15}{4}\left(\dfrac{36}{5}+\dfrac{14}{5}\right)=\dfrac{15}{4}.10=\dfrac{75}{2}=37.5\)