Tim x biet : 17745 : x : 7 = 5
tìm x ' biết ; 17745 ;x ;7 = 5
17745 /x/7=5
17745 : x : 7 = 5
17745 : x : 7 = 5
17745:x=5x7
17745:x=35
x=17745:35
x=507
17745:x:7=5
17745:x =5x7
17745:x =35
x =17745:35
x =507
tick mình nhé!
tim x biet
x-3/x+5=5/7
Ta có: \(\frac{x-3}{x+5}=\frac{5}{7}\)
\(\Rightarrow7.\left(x-3\right)=5.\left(x+5\right)\)
\(\Rightarrow7x-21=5x+25\)
\(\Rightarrow7x-5x=21+25=46\)
\(\Rightarrow2x=46\)
\(\Rightarrow x=46:2=23\)
Vậy x = 23
Ủng hộ mik nha!
tim x biet
/x+2/+/x-5/ = 7
tim x biet 2.(x-5)-3.(x+7)=14
2.(x-5)-3.(x+7)=14
-> 2x-10-3x-21=14
->-x-31=14
->-x=45
->x=-45
Tim X biet X=6/5*7/6*8/7*....*2015/2014 ?
Tim x biet x*7+x*9-x-x*5=290
x =,,,?
Viết lại 1 tí cho thuận mắt
Tức là: 7x + 9x - x - 5x = 290
10x = 290
x = 290 : 10
x = 29
\(x\times7+x\times9-x-x\times5=290\)
=> 7x + 9x - x - 5x = 290
=> 10x = 290
=> x = 290 : 10
=> x = 29
\(x\times7+x\times9-x-x\times5=290\)
\(x\times\left(7+9-1-5\right)=290\)
\(x\times10=290\)
\(x=290:10\)
\(x=29\)
Tim x biet : ( x + 1 ) + ( x + 2 ) ( x + 3 ) + ( x +4 ) + ( x + 5 ) = 4 + 5 + 6 + 7 + 8
Ta có : ( x+1 ) + ( x + 2 ) + ( x + 3 ) + ( x + 4 ) + ( x + 5 ) = 30
( x + x + x +x +x ) + ( 1 + 2 + 3 + 4 + 5 ) = 30
x * 5 + 15 = 30
x * 5 = 30 - 15
x * 5 = 15
x = 15 : 5
x = 3
Vậy x = 3
Duyệt đi , chúc bạn học giỏi
(x + 1) + (x + 2) + (x + 3) + (x + 4) + (x + 5) = 4 + 5 + 6 + 7 + 8
x + 1 + x + 2 + x + 3 + x + 4 + x + 5 = 30
\(x\)x 5 + 15 = 30
\(x\)x 5 = 30 - 15 = 15
x = 15 : 5 = 3