a/  36 460  + 22 478  = 58 938

b/  5486   -   3450   = 20 36

c/  5445   :   9    = 65

d/   3254   x   4     = 13 016

3(5445+4455):47688

=3.9900:47688

=29700:47688

=0.6227...

549

46989 nhaNguyễn Khắc Vinh

14 842 - (599) +5584

=19827

1541 x (-5445)-414

=-8391159

tick cho mk nha nguyen ngoc linh !!!!!!!!!!!!!!!!!!!!!!!

14842-[599]+5584=14243+5584=19827

1541*[-5445]-414=-8390745-414=-8391159

kết quả ở máy tính
 

b: Đặt \(\sqrt{x+1}=a;\sqrt{4-x}=b\)

=>\(a+b+ab=5\)

\(\Leftrightarrow\sqrt{a^2+b^2-2ab}=5-ab\)

=>\(a^2+b^2-2ab=\left(5-ab\right)^2\)

=>\(x+1+4-x-2\sqrt{\left(x+1\right)\left(4-x\right)}=\left(5-\sqrt{\left(x+1\right)\left(4-x\right)}\right)^2\)

\(\Leftrightarrow5-2ab=\left(5-ab\right)^2\)

=>5-2ab=25-10ab+a^2b^2

=>a^2b^2-10ab+25-5+2ab=0

=>a^2b^2-8ab+20=0

=>\(\Leftrightarrow\left(a,b\right)\in\varnothing\)

a: \(\Leftrightarrow\left\{{}\begin{matrix}\sqrt{x+1}-3\sqrt{y-1}=-1\\2\sqrt{x+1}+5\sqrt{y-1}=9\end{matrix}\right.\)

=>\(\Leftrightarrow\left\{{}\begin{matrix}2\sqrt{x+1}-6\sqrt{y-1}=-2\\2\sqrt{x+1}+5\sqrt{y-1}=18\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}-11\sqrt{y-1}=-20\\\sqrt{x-1}-3\sqrt{y-1}=-1\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}y-1=\dfrac{400}{121}\\x-1=\dfrac{2401}{121}\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{2522}{121}\\y=\dfrac{521}{121}\end{matrix}\right.\)

1+1= 2

3+95425=95428

95482655644+8245445=9,549090109^10

656+414=1070

542+45472=46014

686+5445=6131

1+1=2

3+95425=95428

656+414=1070

542+45472=46014

686+5445=6131

1+1= 2

3+95425=95428

95482655644+8245445=95490901089

656+414=1070

542+45472=46014

686+5445=6131

a) \(0\times3=0\)

\(0\times4=0\)

\(0\times5=0\)

b) \(0\times6=0\)

\(0\times7=0\)

\(0\times9=0\)

\(0:6=0\)

\(0:7=0\)

\(0:8=0\)

\(0:9=0\)

Chọn B