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900+(120:1+0:250)
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Lời giải:
$A=2^{50}-2^{49}-...2^2-2$
$-A=2+2^2+2^3+...+2^{49}-2^{50}$
$-2A=2^2+2^3+2^4+...+2^{50}-2^{51}$
$-A-(-2A)=(2-2^{50})-(2^{50}-2^{51})$
$A=2-2^{50}-2^{50}+2^{51}=2-2^{51}+2^{51}=2$
250 : 50 - ( 46 - 75 + 54 ) : 5
= 5 - 25 : 5
= 5 - 5
= 0
Các bạn tk cho mình nha
a) = 8 . 15 - [115- 72 ]
= 8 . 15 - [115- 49 ]
= 120 - 56
= 64
b) = 100 : {250 : [450 - (2.125 - 8.25)]}
= 100 : {250 : [450 - (250 - 200 )]}
= 100 : {250 : [450 - 50]}
= 100 : {250 :400}
= 100 : 0,265
= 0,00265
=
\(a,2^3.15-\left[115-\left(12-5\right)^2\right]\)
\(=8.15-\left[115-\left(12-5\right)^2\right]\)
\(=120-\left[115-7^2\right]\)
\(=120-\left[115-49\right]\)
\(=120-66\)
\(=54\)
\(b,100:\left\{250:\left[450-\left(2.5^3-2^3.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(2.125-8.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(250-200\right)\right]\right\}\)
\(=100:\left\{250:\left[450-50\right]\right\}\)
\(=100:\left\{250:400\right\}\)
\(=100:0,625\)
\(=160\)
\(2^3.15-\left[115-\left(12-5\right)^2\right]=8.15-\left[115-7^2\right]=120-\left[115-49\right]=120-66=54\)
\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}=100:\left\{250:\left[450-\left(4.125-4.25\right)\right]\right\}=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)
\(=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)
\(\left(2x+1\right)\left(y-1\right)=-7\\ \Rightarrow2x+1;y-1\in U_{\left(-7\right)}=\left\{-7;-1;1;7\right\}\)
\(TH1\) | \(TH2\) | \(TH3\) | \(TH4\) | |
\(2x+1\) | \(1\) | \(-1\) | \(7\) | \(-7\) |
\(y-1\) | \(-7\) | \(7\) | \(-1\) | \(1\) |
\(x\) | \(0\) | \(-1\) | \(3\) | \(-4\) |
\(y\) | \(-6\) | \(8\) | \(0\) | \(2\) |
c) 3⁴ - 5.42
= 81 - 210
= -129
d) 120 : {54 - [50 : 2 - (3² - 2.4)]}
= 120 : {54 - [25 - (9 - 8)]}
= 120 : [54 - (25 - 1)]
= 120 : (54 - 24)
= 120 : 30
= 4
900 + ( 120 : 1 + 0 : 250 ) = 900 + ( 120 + 0 )
= 900 + 120
= 1020
Chúc bạn học tốt ! Mik hứa sẽ tk lại ! Thanks !
900+(120:1+0:250)
=900+(120+0)
=900+120
=1020