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Ta có:
aaa : 37 x y =a
a x 111 : 37 x y = a
111 : 37 x y = a : a
3 x y =1
y=1/3
Ta có:
aaa : 37 x y =a
a x 111 : 37 x y = a
111 : 37 x y = a : a
3 x y =1
y=1/3
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 20,11 x 36 + 63 x 20,11 + 20,11
= 20,11 x 36 + 63 x 20,11 + 20,11 x 1
= 20,11 x (36 + 63 + 1)
= 20,11 x 100
= 2011
b. a a a : 37 x y = a
=> 111 x a : 37 x y = a
=> 111 : 37 x a x y = a
=> 3 x a x y = a
=> 3 x y = 1 (cùng chia 2 vế cho a)
=> y = 1 3
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : \(aaa:37\times y=a\)
\(\Rightarrow37\times y=aaa:a\)
\(\Rightarrow37\times y=111\)
\(\Rightarrow y=111:37\)
\(\Rightarrow y=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{aaa}{37\times y}=a\)
\(\Rightarrow37\times y=aaa:a\)
\(37\times y=\frac{aaa}{a}=\frac{111.a}{a}=111\)
\(\Rightarrow37\times y=111\)
\(y=111:37\)
\(y=3\)
\(\frac{\overline{aaa}}{37Y}=a\Leftrightarrow37Y=\frac{\overline{aaa}}{a}=111\Leftrightarrow Y=3\)
Vậy số đó là 3
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1)
( y - 1/5 ) : 2/3 = 3/4
y - 1/5 = 3/4 x 2/3
y - 1/5 = 1/2
y = 1/2 + 1/5
y = 7/10.
2)
7/4 - y x 5/6 = 1/2 + 1/3
7/4 - y x 5/6 = 5/6
7/4 - y = 5/6 : 5/6
7/4 - y = 1
y = 7/4 - 1
y = 3/4
C1 :(y-1/5):2/3=3/4
y-1/5=3/4.2/3
y-15=1/2
y=1/2+15
y=31/2
C2:
7/4-y.5/6=1/2+1/3
7/4-y.5/6=5/6
y.5/6=7/4-5/6
y.5/6=11/12
y=11/12:5/6
y=11/10
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(14,P=x^2+xy+y^2-3x-3y+3\\ P=\left(x^2+xy+\dfrac{1}{4}y^2\right)-3\left(x+\dfrac{1}{2}y\right)+\dfrac{3}{4}y^2-\dfrac{3}{2}y+3\\ P=\left(x+\dfrac{1}{2}y\right)^2-3\left(x+\dfrac{1}{2}y\right)+\dfrac{9}{4}+\dfrac{3}{4}\left(y^2-2y+1\right)\\ P=\left(x+\dfrac{1}{2}y-\dfrac{3}{2}\right)^2+\dfrac{3}{4}\left(y-1\right)^2\ge0\)
Mình thấy đề cứ sai sai kiểu gì ý
Sửa lại đề
\(aaa\div37\times y=a\)
Bài làm
Ta có :
\(aaa\div37\times y=a\)
\(\Rightarrow37\times y=aaa\div a=111\)
\(\Rightarrow y=111\div37=3\)
\(\Rightarrow y=3\)
Ta có :
\(aaa:3\times y=a\)
\(\Rightarrow a\times111\times y:3=a\)
\(\Rightarrow a\times111\times y=a\times3\)
\(\Rightarrow a\times3\times37\times y=a\times3\)
\(\Rightarrow37\times y=1\)( Lược bỏ \(a\times3\)ở 2 vế )
\(\Rightarrow y=1:37\)
\(\Rightarrow y=\frac{1}{37}\)
Vậy \(y=\frac{1}{37}\)
Chúc bạn học tốt !!!