=>0,25y=325

hay y=1300

y x 0,25 = 325

         y   = 325 : 0,25 

         y   = 1300

a)470,04/x*0,01=0,24

470,04/x=0,24/0,01

470,04/x=24

x=470,04/24

x=19,585

b)x*7,25+27,5=100

x*7,25=100-27,5

x*7,25=72,5

x=72,5/7,25

x=10

17,54+x:3,5=64,16

x:3,5=64,16-17.54

x:3,5=46.62

x=46.62:3.5

x=13.32

(x-1,75):0,01:20=41,25

(x-1,75):0,01=41.25x20

(x-1,75):0,01=825

x-1.75=825x0.01

x-1.75=82.5

x=82.5-1.75

x=80.75

A/

 \(17,54+\frac{x}{3,5}=64,16\)

\(\Rightarrow\frac{x}{3,5}=64,16-17,54\)

\(\Rightarrow\frac{x}{3,5}=46,62\)

\(\Rightarrow x=46,62\cdot3,5\)

\(\Rightarrow x=163,17\)

B/ \(\left(x-1,75\right):0,01:20=41,25\)

\(\Rightarrow\left(x-1,75\right):0,01=41,25\cdot20\)

\(\Rightarrow\left(x-1,75\right):0,01=825\)

\(\Rightarrow\left(x-1,75\right)=825\cdot0,01\)

\(\Rightarrow x-1,75=8,25\)

\(\Rightarrow x=8,25+1,75\)

\(\Rightarrow x=10\)

\(\left(99,5-x\right)+3,82=30\)

\(\Rightarrow99,5-x=26,18\)

\(\Rightarrow x=73,32\)

Vậy x = 73,32

X x 99 + X = 300
\(\Rightarrow\)X x 100 = 300
\(\Rightarrow\)X = 3
X x 123 - 245 = 7012
\(\Rightarrow\)X x 123 = 7257
\(\Rightarrow\)X = 7257 : 123
\(\Rightarrow\)X = 59
X x 124 - 2568 = 5988
\(\Rightarrow\)X x 124 = 8556
\(\Rightarrow\)X = 8556 : 124
\(\Rightarrow\)X = 69

X x 99 + X = 300

X x ( 99 + 1 ) = 300

X x 100 = 300

        X = 300 : 100

        X = 3

X x 123 - 245 = 7012

X x 123 = 7012 + 245

X x 123 = 7257

          X = 7257 : 123

          X = 59

X x 124 - 2568 = 5988

X x 124 = 5988 + 2568

X x 124 = 8556

          X = 8556 : 124

          X = 69

X x 99 + X =300

Xx(99+1)=300

X x 100 = 300

X           =3

X x 123 - 245 =7012

X x 123          =7257

X                    =59

X x 124 - 2568 = 5988

X x 124            =8556

X x                   =8556 :124

X                      =69

\(\left(1256+859+5864-2568\right).\left(3.672-7.288\right)\)

\(=5411.\left(2016-2016\right)\)

\(=5411.0=0\)

sai rồi tính ngoạc thứ 2 thôi tính ngoạc 1 làm gì ?

số nào nhân với 0 thì đều bằng 0

(1256+859+5864-2568)x(3x672-7x288)

= (1256+859+5864−2568)x(2016-2016)

= (1256+859+5864−2568)x0

=0

0

= 2006 tk m nhé

1107,785

có thể là =2006 chắc chắn vậy k minh nha

a) 0,01 : 25 = ( 0,75 . x ) : 0,75

\(\Rightarrow\frac{1}{2500}=0,75\cdot x:0,75\)

\(\Rightarrow x=\frac{1}{2500}\)

b) \(\left(3,8\right):\left(2x\right)=\frac{1}{4}:\frac{8}{3}\)

\(\Rightarrow3,8:\left(2x\right)=\frac{3}{32}\)

\(\Rightarrow2x=3,8:\frac{3}{32}=\frac{608}{15}\)

\(\Rightarrow x=\frac{608}{15}:2=\frac{304}{15}\)