\(\left(-6,5\right)\times5,7+5,7\times\left(-3,5\right)\)

\(=\left[\left(-6,5\right)+\left(-3,5\right)\right]\times5,7\)

\(=-10\times5,7\)

\(=-57\)

(-6,5).5,7+5,7.(-3,5)

= (-5,7).(3,5 + 6,5)

= (-5,7) .10 = -57

(-6,5).5,7+5,7.(-3,5)

=5,7[(-6,5)+(-3,5)]

=5,7.(-10)

=-57

chỗ \(\dfrac{3}{5}\) là \(\left|\dfrac{-3}{5}\right|\)

1: \(=5.7\left(-6.5-3.5\right)=-10\cdot5.7=-57\)

\(6,5.5,7+5,7.\left(-3,5\right)\)

= \(5,7.\left[6,5+\left(-3,5\right)\right]\)

= \(5,7.3\)

= \(17,1\)

=

=

=

5,7 x 6,5 + 5,7 x 4,5 - 5,7

= 5,7 x 6,5 + 5,7 x 4,5 - 5,7 x 1

= 5,7 x ( 6,5 + 4,5 - 1 )

= 5,7 x 10

= 57

Học tốt nhé bạn !

(3,5 + 5,7) . x + (3,5 + 5,7) = 0

[(3,5 + 5,7) . (x + 1)] = 0

9,2 . (x + 1) = 0

x + 1 = 0 : 9,2 = 0

=> x = 0 - 1 = -1

Vậy x = -1

Lời giải:

$y\times 3,5=22,19$

$y=22,19:3,5=6,34$

----------

$48,3-y\times 2,8=30,716$

$y\times 2,8=48,3-30,716=17,584$

$y=17,584:2,8=6,28$

-----------

$y:5,7-5,6=12,5$

$y:5,7=12,5+5,6=18,1$

$y=18,1\times 5,7=103,17$

=1/2(2/3*5+2/5*7+...+2/97*99)

=1/2(1/3-1/5+1/5-1/7+...+1/97-1/99)

=1/2*32/99

=16/99

a,`7,2-x:6,5=5,7`

`x:6,5=1,5`

`x=9,75`

`232,8-x=2,56xx4,5`

`232,8-x=11,52`

`x=221,28`

`x-93,1=72,81:18`

`x-93,1=4,045`

`x=97,145`

b, `8,6-8,33:3,4=8,6-2,45=6,15`

`9,52:6,8+3,86=1,4+3,86=5,26`

`(25,46-56,42:4)+16,5xx23=(25,46-14,105)+379,5=11,355+379,5=390,855`