so sanh hai hon so : 3 9/10 29/10
so sanh hai phân số A =\(\frac{10^{29}+5}{10^{29}-2}\)và B =\(\frac{10^{29}}{10^{29}-7}\)
Ta có :
\(A=\frac{10^{29}+5}{10^{29}-2}\)\(=\frac{10^{29}-2+7}{10^{29}-2}\)\(=\frac{10^{29}-2}{10^{29}-2}+\frac{7}{10^{29}-2}\)\(=1+\frac{7}{10^{29}-2}\)
\(B=\frac{10^{29}}{10^{29}-7}=\frac{10^{29}-7+7}{10^{29}-7}=\frac{10^{29}-7}{10^{29}-7}+\frac{7}{10^{29}-7}=1+\frac{7}{10^{29}-7}\)
Vì \(\frac{7}{10^{29}-2}< \frac{7}{10^{29}-7}\Leftrightarrow A< B\)
11/29+9-17+10-19 va 1/2. Hay so sanh
So sanh cac hon so :
a. 3 9/10 ...... 2 9/10 b. 3 4/10 ........... 3 9/10
c. 5 1/10 ....... 2 9/10 d. 3 4/10 ........... 3 2/5
LIKE LIKE LIKE DANG DOI BAN !
cho a la so nguyen khong am . so sanh
(-7).a va (-10).a
cho a la so nguyen va a lon hon hoac bang 3 so sanh
15(a-3) va 11(a-3)
câu a:(-7)*a lớn hơn hoặc bằng (-10)*a
câu b 15*(a-3) lớn hơn hoặc bằng 11*(a-3)
9/10........9+3/10+3
so sanh 2 phan so
9/10 ..... 9 + 3/10 + 3
9/10....... 12/13
9/10=117/130
12/13 = 120/130
Vì 120/130 > 117/130 Nên 9 + 3/10 + 3 > 9/10
Giup minh nhe
Khong tinh tong cua 3 phan so sau, hay chung to rang tong do nho hon 2:
A = 11/29 + 9/17 + 10/19
Khong tinh tong cua ba phan so sau, hay chung to rang tong do nho hon 2:
A= 11/ 29+ 9/ 17 + 10/ 19
ko quy dong mau so hay so sanh: A=-9/10^2015+-19/10^2016 va -9/10^2016+-19/10^2015
So sanh so 8/9 va 9/10 bang hai cach
A, quy dong tu
B,khong quy dong mau ,tu
1-8/9=1/9 1-9/10=1/10 1/9 >1/10 nen 8/9<9/10