X x 3 + X x 5 = 4800
Tính nhẩm
3000 x 2 : 3 =
4800 : 8 x 4 =
4000 : 5 : 2 =
3000 x 2 : 3 = 2000
4800 : 8 x 4 = 2400
4000 : 5 : 2 = 400
x.4800+x.5200=100000 x:25+x:5=1800
b: <=>x:30=1800
hay x=54000
\(\dfrac{4800}{x}-\dfrac{4800}{x+100}=8\)
giải pt
ĐK: ` x\ne 0; x \ne -100`
`4800/x-4800/(x+100)=8`
`<=>1/x-1/(x+100) =1/600`
`<=> (x+100-x)/(x(x+100) = 1/600`
`<=> 100/(x(x+100))=1/600`
`<=> x^2+100x = 60000`
\(\left[{}\begin{matrix}x=200\\x=-300\end{matrix}\right.\)
Vậy...
`4800/x-4800/(x+10)=8`
`ĐK:x ne 0,x ne -10`
`pt<=>600/x-600/(x+10)=1`
`<=>(600x+6000-600x)/(x^2+10x)=1`
`<=>6000/(x^2+10x)=1`
`<=>x^2+10x=6000`
`<=>x^2+10x-6000=0`
`Delta'=25+6000=6025`
`<=>x_1=20,x_2=-30`
a) 4800:X+130/4 + 255= 7.3 x 50
b) X/27=3/X
4800 x 3 phần 4 = ?
Kết quả là 1200,075 .
Nhớ chấm là đúng cho tui :))
4800 * 3/4= 3600
4800 x3/4=3600
1) tim so nguyen x thoa man
a) -1-2-3-4 -...-x= 1275
b) -1-3-5-...- ( 2n -1) =-225
c) 16n -20n -24n-...-40n-44n =4800
48 x X -96 = 4800
48 x X = 4896
X = 4896 : 48
X = 102
48 x X - 96 = 4800
48 x X = 4800 + 96 = 4896
X = 4896 : 48 = 102
tìm x 4800:(x*4)=8
Tìm x:
4800: (x × 16) = 25
4800: ( x x 16) = 25 x x 16 = 4800 : 25 x x 16 = 192 x = 192 : 16 x = 12 |