2020 - x /8 *10
So sánh
c/M=2019/2020+2020/2021vàN=2019+2020/2020+2021
d/A=108+2/108-1bà B=108/108=3
c) \(M=\frac{2019}{2020}+\frac{2020}{2021}\) và \(N=\frac{2019+2020}{2020+2021}\)
Ta có \(\frac{2019}{2020}>\frac{2019}{2020+2021}\)
\(\frac{2020}{2021}>\frac{2020}{2020+2021}\)
\(\Rightarrow\frac{2019}{2020}+\frac{2020}{2021}< \frac{2019+2020}{2020+2021}=N\)
\(\Rightarrow M>N\)
Tìm Min
1)A=(x-1)^2020+/x-1/+100
2)B=/x-8/+/x-9/+/x-10/+2020
Khẳng định nào sau đây là đúng vì sao a 2051 x 11 + 10 chia hết cho 11 b 97 x 32 + 8 / 8 C 2020 x 30 + 8 x 5 chia hết cho 10
So sánh :
A.10^8 và 2^8×5^8
B.12^10/2^10 và 3^10×2^10
C.6^2020 và 2^2020×3^2020
Tìm y biết: 2020 - y : 8 x 10 = 1000
Tìm y biết:
2020 - y : 8 x 10 = 1000
y : 8 x 10 = 2000 - 1000
y : 8 x 10 = 1000
y : 8 = 1000 : 10
y : 8 = 100
y = 100 x 8
y = 800
Vậy y = 800
\(2020-y:8\times10=1000\)
\(2020-y:80=1000\)
\(y:80=2020-1000\)
\(y:80=1020\)
\(y=1020\times80\)
\(y=81600\)
2020-y:8=1000:10
2020-y:8=100
2020-y=100x8
2020-y=800
y=2020-800=1220
Bài 1: Tính giá trị của biểu thức sau
A=1-\(\dfrac{50-\dfrac{4}{2018}+\dfrac{2}{2019}-\dfrac{2}{2020}}{100-\dfrac{8}{2018} +\dfrac{4}{2019}-\dfrac{4}{2020}}\)
B=\(\dfrac{5^{10}.7^3-25^5.49^2}{\left(125.7\right)^3+5^9.14^3}\)
C=\(x^{2020}\)-\(y^{2020}\)+\(xy^{2019}\)-\(x^{2019}\).y+2019 biết x-y=0
Mong mn giúp đỡ
a: \(A=1-\dfrac{2\left(25-\dfrac{2}{2018}+\dfrac{1}{2019}-\dfrac{1}{2020}\right)}{4\left(25-\dfrac{2}{2018}+\dfrac{1}{2019}-\dfrac{1}{2020}\right)}\)
=1-2/4=1/2
b: \(B=\dfrac{5^{10}\cdot7^3-5^{10}\cdot7^4}{5^9\cdot7^3+5^9\cdot7^3\cdot2^3}\)
\(=\dfrac{5^{10}\cdot7^3\left(1-7\right)}{5^9\cdot7^3\left(1+2^3\right)}=5\cdot\dfrac{-6}{9}=-\dfrac{10}{3}\)
c: x-y=0 nên x=y
\(C=x^{2020}-x^{2020}+y\cdot y^{2019}-y^{2019}\cdot y+2019\)
=2019
2019/2020 x 7/8+2019/2020 x3/8-2019/2020 x1/4
tim x, y thuoc Q: (2x-7)^2018+(3y+8)^2020<=8
cho a/7=b/8=c/9=10. tinh P=6a+3b-7c/8a+9b-10c
Tính giá trị của E= \(x^{10}-2019x^9-2019x^8-...-2019x-1\) biết x=2020
x=2020 => x-1=2019
\(E=x^{10}-\left(x-1\right)x^9-\left(x-1\right)x^8-...-\left(x-1\right)x-1\)
\(=x^{10}-x^{10}+x^9-x^9+x^8-...-x^2+x-1\)
\(=x-1=2019\)