Tính hợp lý
–( –2019 + 2020 ) + (– 2019 ) – ( 1234 – 2020 )
– 25.800 .( – 0,04).1,25.2020
( 5678 – 975 ) – (– 975 + 678 ) + 4000
– 78. (–245 ) + 245. 22
765.( – 36) – 765. 64
5632.121 + 5632 – 5632.22
K
Khách
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Những câu hỏi liên quan
12 tháng 3 2020
1/ -2020 + (1543 + 2020)
\(=-2020+1543+2020\)
\(=-2020+2020+1543\)
\(=0+1543\)
\(=1543\)
2/ (245 – 97) – 245
\(=245-97-245\)
\(=245-245-97\)
\(=0-97\)
\(=-97\)
3/ (-145) – (118 – 145)
\(=-145-118+145\)
\(=-145+145-118\)
\(=0-118\)
\(=-118\)
4/ (-36 + 89) - (145 + 89 – 36)
\(=-36+89-145-89+36\)
\(=\left(-36+36\right)+\left(89-89\right)-145\)
\(=0+0-145\)
\(=-145\)
học tốt
3 tháng 4 2020
(-1) + 2 + (-3) + 4 + ... + (-2019) + 2020
= [ (-1) + 2 ] + [ (-3) + 4 ] + ... + [ (-2019) + 2020 ]
= 1 + 1 + ... + 1
= 1 . 1010
= 1010
3 tháng 4 2020
(-1)+2+(-3)+4+...+(-2019)+2020
=(-1+2)+(-3+4)+...+(-2019+2020)
=1+1+...+1 (có 1010 số 1)
=1.1010
=1010
NT
1
30 tháng 4 2022
1234 x 5678 x ( 630 - 315 x 2) : 2020
= 1234 x 5678 x (630 -630 ) : 2020
= 1234 x5678 x 0 : 2020
= 0
Y
5
12 tháng 2 2020
a)-2020+(2019-1968)-(2019-2020)=2020+51-(-1)=2071+1=2072
b)-37x16+36x(-37)-2x(-37)=-37x(16+36-2)=-37x50=-1850
c)1000:(-10)2+3.(-5)-(-155).0=-100.2+(-15)-0=-200+-15=-215
28 tháng 6 2021
Ta có: \(A=\left(2020^{2019}+2019^{2019}\right)^{2020}\)
\(=\left(2019^{2019}+2020^{2019}\right)^{2019}\cdot\left(2019^{2019}+2020^{2019}\right)\)
\(\Leftrightarrow\dfrac{A}{B}=\dfrac{\left(2019^{2019}+2020^{2019}\right)^{2019}\cdot\left(2019^{2019}+2020^{2019}\right)}{\left(2020^{2020}+2019^{2020}\right)^{2019}}\)
\(\Leftrightarrow\dfrac{A}{B}=\dfrac{2019^{2019}+2020^{2019}}{2019+2020}>1\)
\(\Leftrightarrow A>B\)
ND
Nguyễn Đức Trí
VIP
1 tháng 12 2023
\(A=\dfrac{2020^{2018}-1}{2020^{2019}+2019}\)
\(B=\dfrac{2020^{2019}+1}{2020^{2020}+2019}\)
Ta có :
\(A-B=\dfrac{2020^{2018}-1}{2020^{2019}+2019}-\dfrac{2020^{2019}+1}{2020^{2020}+2019}\)
\(\Rightarrow A-B=\dfrac{\left(2020^{2018}-1\right)\left(2020^{2020}+2019\right)-\left(2020^{2019}+2019\right)\left(2020^{2019}+1\right)}{\left(2020^{2019}+2019\right)\left(2020^{2020}+2019\right)}\)
\(\Rightarrow A-B=\dfrac{2020^{4038}+2019.2020^{2018}-2020^{2020}-2019-2020^{4038}-2020^{2019}-2019.2020^{2018}-2029}{\left(2020^{2019}+2019\right)\left(2020^{2020}+2019\right)}\)
\(\Rightarrow A-B=\dfrac{-\left(2020^{2020}+2020^{2019}+2.2019\right)}{\left(2020^{2019}+2019\right)\left(2020^{2020}+2019\right)}\)
mà \(\left\{{}\begin{matrix}-\left(2020^{2020}+2020^{2019}+2.2019\right)< 0\\\left(2020^{2019}+2019\right)\left(2020^{2020}+2019\right)>0\end{matrix}\right.\)
\(\Rightarrow A-B< 0\)
\(\Rightarrow A< B\)
Vậy ta được \(A< B\)
R
20 tháng 8 2019
Trả lời
a)964.3+496.4-496.6
=964.3+[496.(4-6)]
=964.3+(-992)
=2892+(-992)
=1900
b)2019.(2020+1)-2019.2020
=2019.2020.2019-2019.2020
=2019
c)436+324.(234-1)-234.324+324
=436+324.234-324-234.324+324
=436
d)472.(36-1)+35.8
=472.35+35.8
=35.(472+8)
=35.480
=16 800
Ko chắc nha, sai thì cho mk xl vì làm phiền bạn !
20 tháng 8 2019
b)2019.(2020+1)-2019.2020
=2019.(2020+1-2020)
=2019.1
=2019
\(\text{–( –2019 + 2020 ) + (– 2019 ) – ( 1234 – 2020 ) }\)
\(=2019-2020-2019-1234+2020\)
\(=\left(2019-2019\right)+\left(-2020+2020\right)-1234\)
\(=0+0-1234=-1234\)
\(\text{– 25.800 .( – 0,04).1,25.2020}\)
\(=\left(-25\right).\left(-0,04\right).800.1,25.2020\)
\(=1.1000.2020=2020000\)
\(\text{( 5678 – 975 ) – (– 975 + 678 ) + 4000 }\)
\(=5678-975+975-678+4000\)
\(=\left(5678-678\right)+\left(-975+975\right)+4000\)
\(=5000+0+4000=9000\)
\(\text{– 78. (–245 ) + 245. 22}\)
\(=245.\left(78+22\right)\)
\(=245.100=24500\)
\(\text{765.( – 36) – 765. 64 }\)
\(=765.\left[\left(-36\right)-64\right]\)
\(=765.\left(-100\right)=-76500\)
\(\text{5632.121 + 5632 – 5632.22 }\)
\(=5632.\left(121+1-22\right)\)
\(=5632.100=563200\)
chúc bạn học tốt !!!!