\(2,5\) x \(9,5\) x \(4+20\) x \(9,5\) x \(0,5\) +\(9,5\) x \(8\) x \(1,25\)

\(=9,5\) x ( \(2,5\) x \(4+20\) x \(0,5\) + \(8\) x \(1,25\) )

\(=9,5\) x \(30\)

\(=285\)

285

\(9,5x+2,5\left(1-x\right)=3,95\)

\(\Leftrightarrow9,5x+2,5-2,5x=3,95\)

\(\Leftrightarrow7x=1,45\)

\(\Leftrightarrow x=\dfrac{29}{140}\)

9,5.x+2,5.(1-x)=3,95` 

`⇒` `(14x+5)/2` `=` `79/20`

`⇒` `((14x+5).20)/20` `=` `(2.79)/20`

`⇒` `(4x+5).20=2.79`

`⇒` `14x+5=79/10`

`⇒` `14x=29/10`

`⇒` `x` `=` `29/140` `≈` `0,2071`

\(9,5\times3,7+9,5\times1,3+9,5:0,25+9,5\)

\(=9,5\times3,7+9,5\times1,3+9,5\times4+9,5\)

\(=9,5\times\left(3,7+1,3+4+1\right)\)

\(=9,5\times10\)

\(=95\)

( 11 x 9 - 900 x 0.1- 8) x ( 56.7 x 0.5 + 56.7 x 9.5)

=(99 - 90 - 8) x [56.7(0.5+9.5)]

=1 x [56.7x10]

=1x 567=567

( 11 x 9 - 900 x 0.1- 8) x ( 56.7 x 0.5 + 56.7 x 9.5)

=(99 - 90 - 8) x [56.7(0.5+9.5)]

=1 x [56.7x10]

=1x 567=567

9,5 x 4,7 + 9,5 x 4,3 + 9,5 x 1

= 9,5 x (4,7 + 4,3 + 1)

= 9,5 x 10

= 95

= 9,5 x (4,7 + 4,3 ) + 9,5 

= 9,5 x 9 + 9,5 

= 85,5 + 9,5

= 95 

nhớ tích cho mình nha mình cảm ơn rất nhìu

9.5x4,7+9,5x4,3+9,5 = 95

6,8

9,5 - x = 2,7

x = 9,5 - 2,7

x = 6,8

31