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\(\left(2x-1\right)\left(y^2-5\right)=12\)
\(\left(2x-1\right)\left(y^2-5\right)=12=1.12=12.1=2.6=6.2=3.4=4.3\)
\(\Rightarrow\orbr{\begin{cases}2x-1=1\\y^2-5=12\end{cases}\Rightarrow}\orbr{\begin{cases}2x=2\\y^2=17\end{cases}\Rightarrow\orbr{\begin{cases}x=1\\y=\sqrt{17}\end{cases}}}\)( loại )
\(\Rightarrow\orbr{\begin{cases}2x-1=12\\y^2-5=1\end{cases}\Rightarrow\orbr{\begin{cases}2x=13\\y^2=6\end{cases}\Rightarrow}}\orbr{\begin{cases}x=\frac{13}{2}\\y=\sqrt{6}\end{cases}}\)( loại )
Đến đây bạn tự làm típ nha :))))
a)Số chia là :
( 6185 - 29 ) : ( 75 + 1 ) = 81
Số bị chia là :
6185 - 81 = 6104
Đáp số : số chia : 81
số bị chia : 6104
b) Số chia là :
( 2324 - 12 ) : ( 67 + 1 ) = 34
Số bị chia là :
2324 - 34 = 2290
Đáp số : số chia : 34
số bị chia : 2290
a,Số chia là : ( 6185 - 29 ) : ( 75 + 1 ) = 81
Số bị chia là : 81 x 75 + 29 = 6104
b,Thương là : ( 2324 - 12 ) ; ( 67 + 1 ) = 34
Số bị chia là ; 34 X 67 + 12 = 2290
Gọi 2 số tự nhiên cần tìm là a;b
Theo bài ra ta có :
a + b = a.b
=> a.b - a - b = 0
=> a(b - 1) - b = 0
=> a(b - 1) - (b - 1) = 1
=> (a - 1).(b - 1) = 1
Với \(a;b\inℕ^∗\Rightarrow\hept{\begin{cases}a-1\inℕ^∗\\b-1\inℕ^∗\end{cases}}\)
Khi đó có 1 = 1.1
=> \(\hept{\begin{cases}a-1=1\\a-1=1\end{cases}\Rightarrow a=b=2}\)
Vậy cặp số (a;b) thỏa mãn là : (2 ; 2)
a.(n+3).(n2+1)=0
\(\Leftrightarrow n+3=0;n^2+1=0\)
TH1:n+3=0
\(\Rightarrow\)n=0-3
\(\Rightarrow\)n=-3
TH2:n2+1=0
\(\Rightarrow\)n2=-1
\(\Rightarrow\)n=\(\varnothing\)
Vậy n=-3
nhớ k mk nha
a, (n+3)(n2+1)=0
n=3 (vì n2+1 lớn hơn 0)
b, (n-1)(n2-4)=0
suy ra n-1=0 hoặc n2-4=0
suy ra n=1 hoặc n2=4
suy ra n=1 hoặc n=4
(3n+2)⋮(2n-1)
(2n-1)+(n+3)⋮(2n-1)
Vì (2n-1)⋮(2n-1)=>(n+3)⋮(2n-1)
Vì (n+3)⋮(2n-1)=>2(n+3)⋮(2n-1)
(2n+6)⋮(2n-1)
(2n+6)=(2n-1)+7⋮(2n-1)
Vì (2n-1)⋮(2n-1)=>7⋮(2n-1)
Vậy 2n-1ϵƯ(7)={1;7}
Với 2n-1=1=>2n=2=>n=1
2n-1=7=>2n=8=>n=4
Vậy n ∈{1;4}
câu 1:
chiều dài là a;chiều rộng là b;diện tích tam giác là a.h/2(a là đọ dài cạnh đáy,h là chiều cao tương ứng)
câu 2:
0
....(nản.thi vio phải ko)_
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dư 0,21
dễ mà,hok tốt
=0,89 dư 0,021