So sánh A = 10^8+2 / 10^8-1 ; B= 10^8 / 10^8-3
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{10^8+2}{10^8-1}=\frac{10^8-1+3}{10^8-1}=\frac{10^8-1}{10^8-1}+\frac{3}{10^8-1}=1+\frac{3}{10^8-1}\)
\(B=\frac{10^8}{10^8-3}=\frac{10^8-3+3}{10^8-3}=\frac{10^8-3}{10^8-3}+\frac{3}{10^8-3}=1+\frac{3}{10^8-3}\)
Vì 108-1 > 108-3
=>\(\frac{3}{10^8-1}< \frac{3}{10^8-3}\)
=>\(1+\frac{3}{10^8-1}< 1+\frac{3}{10^8-3}\Rightarrow A< B\)
Ta có: A = 108 + 2/ 108 - 1 = 3/108 - 1
B = 108 / 108 - 3 = 3 / 108 -3
Vì 3 / 108 - 1 < 3 / 108 -3 nên
Nên A< B
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:\(A=\frac{10^8+2}{10^8-1}\)
\(\Rightarrow A=\frac{10^8-1+3}{10^8-1}=\frac{10^8-1}{10^8-1}+\frac{3}{10^8-1}=1+\frac{3}{10^8-1}\)
Ta có:\(B=\frac{10^8}{10^8-3}\)
\(\Rightarrow B=\frac{10^8-3+3}{10^8-3}=\frac{10^8-3}{10^8-3}+\frac{3}{10^8-3}=1+\frac{3}{10^8-3}\)
Vì \(\frac{3}{10^8-1}
![](https://rs.olm.vn/images/avt/0.png?1311)
A=10^8+2/10^8-1
A=2/-1=-2
B=10^8/10^8-3
b=1/-3=-3
mà -2>-3 >>A>B
![](https://rs.olm.vn/images/avt/0.png?1311)
A=10^8+2/10^8-1=10^8-1+3/10^8-1
=10^8-1/10^8-1+3/10^8-1=1+3/10^8-1=1/3/...
B=10^8/10^8-3=10^8-3+3/10^8-3
=10^8-3/10^8-3+3/10^8-3=1+3/10^8-3=1/3/...
tu (1) va (2) =>1/3/10^8-1<1/3/10^8-3(vi phân so nao
co mau be hon thi phân so do lon hon nen 10^8-1>10^8-3)
Hay A<B
k mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{10^8+2}{10^8-1}=-2\)
\(B=\frac{10^8-3}{10^8}=-3\)
\(\Rightarrow A>B\left(-2>-3\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{10^8+2}{10^8-1}=1+\frac{3}{10^8-1}>1+\frac{3}{10^8-3}=\frac{10^8}{10^8-3}=B\)
vậy A>B
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
A=10^8+2/10^8-1=10^8-1+3/10^8-1
=10^8-1/10^8-1+3/10^8-1=1+3/10^8-1=1/3/...
B=10^8/10^8-3=10^8-3+3/10^8-3
=10^8-3/10^8-3+3/10^8-3=1+3/10^8-3=1/3/...
tu (1) va (2) =>1/3/10^8-1<1/3/10^8-3(vi phân so nao
co mau be hon thi phân so do lon hon nen 10^8-1>10^8-3)
Hay A<B
Nguồn: cho hỏi bài toán lớp 6? | Yahoo Hỏi & Đáp
A=10^8+2/10^8-1=10^8-1+3/10^8-1
=10^8-1/10^8-1+3/10^8-1=1+3/10^8-1=1/3/...
B=10^8/10^8-3=10^8-3+3/10^8-3
=10^8-3/10^8-3+3/10^8-3=1+3/10^8-3=1/3/...
tu (1) va (2) =>1/3/10^8-1<1/3/10^8-3(vi phân so nao
co mau be hon thi phân so do lon hon nen 10^8-1>10^8-3)
Hay A<B
2) (1/26+1/50) : 1 + 1....(con khúc cuối do ban tu gjaj quyết di
tinh xong la hết bai 2)
giai thích bai 2) vi sao mjnh laj lam (1/26+1/50) : 1 + 1 vi
mjnh lay so dau + so cuoi chia khoang cach so hang va + 1,
do la cong thuc tinh, ban hay co gang nho va van dung vao thi cu ,
cho mjnh 5 * nhe :D)