\(75\%x+\frac{3}{4}x+x=30\)

\(\Leftrightarrow\left(75\%+\frac{3}{4}+1\right)x=30\)

\(\Leftrightarrow\frac{5}{2}x=30\)

\(\Leftrightarrow x=30:\frac{5}{2}\)

\(\Leftrightarrow x=12\)

đổi 75%=3/4.Ta có:

3/4xX+3/4xX+X=30

(3/4+3/4+1)xX=30

    5/2     x    X=30

                 X  = 30:5/2

                X   = 12

\(75\%\times x+\frac{3}{4}\times x+x=30\)

\(\frac{3}{4}\times x+\frac{3}{4}\times x+1\times x=30\)

\(\left(\frac{3}{4}+\frac{3}{4}+1\right)\times x=30\)

\(\frac{5}{2}\times x=30\)

\(x=30\div\frac{5}{2}\)

\(x=12\)

giá xăng từ 20 000 đồng lên 21 000 đồng 1 lít . hỏi giá xăng tăng bao nhiêu phần trăm? 

0,75 x X + 0,75 x X + X = 30

X x ( 0,75 + 0,75 + 1 ) = 30

X x 2,5 = 30

X = 30 : 2,5

X = 12

75%xX+3/4xX+X=30

<=>3/4xX+3/4xX+X=30

<=>10/4xX=30

<=>10xX=120

<=>X=120/10=12

Vậy X=12

= 75% x X + 3/4 x X + X = 30

= X x (3/4 + 3/4 + 1) = 30

= X x 10/4 = 30

= X = 30 : 10/4

X = 12

0,75x + 0,75x = 30

0,75 . 2x = 30

2x = 40

x = 20

\(75\%\cdot x+\frac{3}{4}\cdot x+x=30\)

\(x\cdot\left(\frac{3}{4}+\frac{3}{4}+1\right)=30\)

\(x\cdot\frac{5}{2}=30\)

\(x=30\cdot\frac{2}{5}\)

\(x=12\)

\(75\%\cdot x+\frac{3}{4}\cdot x+x=30\)

\(\frac{3}{4}\cdot x+\frac{3}{4}\cdot x+x=30\)

\(\left(\frac{3}{4}+\frac{3}{4}\right)\cdot x+x=30\)

\(\frac{3}{2}\cdot x+x=30\)

\(\frac{3}{2}\cdot x+\frac{1}{1}\cdot x=30\)

\(\left(\frac{3}{2}+\frac{1}{1}\right)\cdot x=30\)

\(\frac{5}{2}\cdot x=30\)

\(x=30\text{ : }\frac{5}{2}\)

\(x=12\)

giải i mn huhu pls

cần dc giải mai tui họccc

\(60+x-34=43\Rightarrow x=43+34-60=17\)

\(23x-6.23+69x=230\)

\(\Rightarrow23x+69x=230+6.23\)

\(\Rightarrow92x=368\Rightarrow x=368:92\Rightarrow x=4\)

\(\left(15.24-x\right):0,25=100:0,25\)

\(\Rightarrow\left(360-x\right)=100:0,25.0,25\)

\(\Rightarrow360-x=100\Rightarrow x=360-100=260\)

\(\left(7x+8\right):5=10\Rightarrow\left(7x+8\right)=10.5\)

\(\Rightarrow7x+8=50\Rightarrow7x=50-8\Rightarrow7x=42\Rightarrow x=42:7=6\)

\(280:\left(7+3x\right)=4\Rightarrow\left(7+3x\right)=280:4\)

\(\Rightarrow7+3x=70\Rightarrow3x=70-7\Rightarrow3x=63\Rightarrow x=63:3=21\)

\(\left(x+5\right)x19:13=57\)

\(\Rightarrow\left(x+5\right)x19=57.13\)

\(\Rightarrow\left(x+5\right)=741:19\Rightarrow x+5=39\Rightarrow x=39-5=34\)

\(4\left(36-4x\right)=64\)

\(\Rightarrow\left(36-4x\right)=64:4\)

\(\Rightarrow36-4x=16\)

\(\Rightarrow4x=36-16\Rightarrow4x=20\Rightarrow x=20:4=5\)

\(\left(7,6:1,9\right)x=3,2\)

\(\Rightarrow4x=3,2\Rightarrow x=3,2:4=0,8\)

\(\left(x:2+50\right):5=12\)

\(\Rightarrow x:2+50=12.5\)

\(\Rightarrow x:2=60-50\Rightarrow x:2=10\Rightarrow x=10.2=20\)

cứu tui

1. \(x-8+32=68\)

\(x-8=68-32\)

\(x-8=36\)

\(x=36+8\)

\(x=44\)

_____

2. \(x+8+32=68\)

\(x+8=68-32\)

\(x+8=36\)

\(x=36-8\)

\(x=28\)

_____

3. \(98-x+34=43\)

\(98-x=43-34\)

\(98-x=9\)

\(x=98-9\)

\(x=89\)

_____

4. \(98+x-34=43\)

\(98+x=43+34\)

\(98+x=77\)

\(x=77-98\)

\(x=-21\)

_____

5. \(x:5:4=800\)

\(x:5=800.4\)

\(x:5=3200\)

\(x=3200.5\)

\(x=16000\)

_____

6. \(18+x=384:8\)

\(18+x=48\)

\(x=48-18\)

\(x=30\)

_____

7. \(\left(84,6-2\times x\right):3,02=5,1\)

\(84,6-2.x=5,1.3,02\)

\(84,6-2.x=15,402\)

\(2.x=84,6-15,402\)

\(2.x=69,198\)

\(x=69,198:2\)

\(x=34,599\)

_____

8. \(x\times5=120:6\)

\(x.5=20\)

\(x=20:5\)

\(x=4\)

_____

9. \(\left(15\times24-x\right):0,25=100:0,25\)

\(\left(15.24-x\right):0,25=400\)

\(15.24-x=400.0,25\)

\(15.24-x=100\)

\(360-x=100\)

\(x=360-100\)

\(x=260\)

1,x-8+32=68

=>x-8=68-32=36

=>x=36+8=42

2,x+8+32=68

=>x+8=68-32=36

=>x=36-8=28

3,98-x+34=43

=>98-x=43-34=9

=>x=98-9=89

4,98+x-34=43

=>98+x=43+34=77

=>x=77-98=-21

5,x:5:4=800

=>x:20=800

=>x=800x20=16000

6,18+x=384:8=48

=>x=48-18=30

7,(84,6-2x):3,02=5,1

=>84,6-2x=5,1x3,02=15,402

=>2x=84,6-15,402=69,198

=>x=69,198:2=34,599

8,5x=120:6=20

=>x=20:5=4

9,(15x24-x):0,25=100:0,25=400

=>360-x=400x0,25=100

=>x=360-100=260.

1. \(...\Rightarrow x+24=68\Rightarrow x=68-24=44\)

2. \(...\Rightarrow x+40=68\Rightarrow x=68-40=28\)

3. \(...\Rightarrow3^{2\left(8+x\right)}=9=3^2\Rightarrow2\left(8+x\right)=2\Rightarrow8+x=1\Rightarrow x=-7\)

4. \(...\Rightarrow3^{2\left(8+x\right)}=77\) (bạn xem lại đề)

5. \(...\Rightarrow x:5=800.4\Rightarrow x:5=3200\Rightarrow x=3200.5=16000\)

6. \(...\Rightarrow18+x=48\Rightarrow x=48-18=30\)

7. \(...\Rightarrow84,6-2x=5,1.3,02=15,402\Rightarrow2x=84,6-15,402\Rightarrow2x=69,198\Rightarrow x=34,599\)

8. \(...\Rightarrow5.x=20\Rightarrow x=20:5=4\)

9. \(\left(360-x\right):0,25=400\Rightarrow360-x=400.0,25=100\Rightarrow x=400-100=300\)

x+0,25=3,6+10,75

x+0,25=14,35

x+0,25=14,35-0,25

x+0,25=14,1

x        =14,1-0,25

x=13,85

ta có
x + 0,25 = 43/4 - 18/5
=> x + 1/4 = 143/20
=> x = 143/20 - 1/4
=> x = 25/4
vậy x = 25/4