\(8,75\cdot x+1,25\cdot x=20\)

 \(\left(8,75+1,25\right)\cdot x=20\)

                            \(10\cdot x=20\)

                                    \(x=20:10\)

                                    \(x=2\)

=>\(x\)x(8,75+1,25)=20

=>\(x\)x10=20

=>\(x\)      =20:10

=>\(x\)      =2

\(\left(2,7+1,8\right).2.1,5=13,5\)

\(\left(\frac{6}{5}.\frac{3}{4}\right).2.\frac{2}{3}=1,2\)

\(2,7.1,8.1,5=7,29\)

\(\frac{6}{5}.\frac{3}{4}.\frac{2}{3}=0,6\)

\(16.16.6=1536\)

= 13,5.

= \(\frac{6}{5}\).

= 7,29.

= \(\frac{3}{5}\).

= 1536.

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#)Giải :

    8,75 x X + 1.25 x X = 20

    ( 8,75 + 1,25 ) x X   = 20

         10 x X               = 20

                 X               = 20 : 10

                 X               = 2 

      #~Will~be~Pens~#

\(8,75.x+1,25.x=20\)

\(\Rightarrow x.\left(8,75+1,25\right)=20\)

\(\Rightarrow x.10=20\)

\(\Rightarrow x=20:10\)

\(\Rightarrow x=2\)

Vậy x = 2

~Study well~

#ARMY_BLINK#

x:6=24+6

x:6=30

x=30 x 6

x=180

23+x:2=37

x:2=37-23

x:2=14

x=14 x 2

x=28

214-136:x=197

136:x=214-197

136:x=17

x=136:17

x=8

(x-4):6:5=10

(x-4):6=10 x 5=50

(x-4)=50 x 6

x-4=300

x=300+4=304

(x+1)+(x+2)+...+(x+10)=755

10x + (1+2+...+10)=755

10x + (1+10) x [(10-1):1+1]:2=755

10x + 55 = 755

10x=755-55

10x=700

x=700:10=70

chúc bạn học tốt nha

2 - x = \(\frac{1}{5}\): \(\frac{1}{4}\)                                          

2 -x = \(\frac{4}{5}\)

    x = 2 - \(\frac{4}{5}\)

   x = \(\frac{6}{5}\)

3 - x \(\times\) \(\frac{1}{3}\)= \(\frac{1}{6}\) \(\Rightarrow\) 3 - x = \(\frac{1}{6}\) \(\div\frac{1}{3}\)

                                                 3 - x = \(\frac{1}{2}\) \(\Rightarrow\) x = 3 - \(\frac{1}{2}\) \(\Rightarrow\) x = \(\frac{5}{2}\)

=2.3.4.5.6=720

a/

\(1\frac{1}{2}x1\frac{1}{3}x1\frac{1}{4}x1\frac{1}{5}x1\frac{1}{6}=\frac{3}{2}x\frac{4}{3}x\frac{5}{4}x\frac{6}{5}x\frac{7}{6}=\frac{7}{2}=3\frac{1}{2}\)

b/ 

x=0; y=5

(8 x 18 - 5 x 18 - 18 x 3)x + 2x = 8 x 7 + 24

<=> [18 x (8 - 5 - 3)]x + 2x =   80

<=> 2x = 80

<=> x = 40,k nhé bạn

(8x18-5x18-18x3)xX+2xX=8x7+24

=>8x(8-5-3)xX+2xX=80

=>8x0xX+2xX=80

=>0+2xX=80

=>X=80:2

=>X=40