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tận cùng là 5 mũ 1 số lớn hơn 0 lúc nào chả có tận cùng là 5:v
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\(\left(x+2\right)^2=\left(2x-1\right)^2\\ \Leftrightarrow\left(x+2\right)^2-\left(2x-1\right)^2=0\\\Leftrightarrow\left[x+2-\left(2x-1\right)\right]\left[x+2+2x-1\right]=0\\ \Leftrightarrow\left(x+2-2x+1\right)\left(x+2+2x-1\right)=0\\ \Leftrightarrow\left(-x+3\right)\left(3x+1\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}-x+3=0\\3x+1=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}-x=-3\\3x=-1\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=3\\x=-\dfrac{1}{3}\end{matrix}\right.\)
\(\left(x+2\right)^2=\left(2x-1\right)^2\)
\(\Leftrightarrow\left[{}\begin{matrix}x+2=2x-1\\x+2=-\left(2x-1\right)\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x-2x=-1-2\\x+2=-2x+1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}-x=-3\\x+2x=1-2\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\3x=-1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-\dfrac{1}{3}\end{matrix}\right.\)
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gọi số thứ nhất là x (x<80 , x>14)
số thứ 2 là : x+14
vì tổng 2 số = 80 nên ta có phương trình
x+x+14=80
<=>2x+14=80
<=>x=33
số thứ 2 là : x+14=33 +14=47
k dùm :v :v :v
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x^3-6x^2+12x-8=0
-> x^3-2x^2-4x^2+8x+4x-8=0
-> x^2(x-2)-4x(x-2)+4(x-2)=0
-> (x-2)(x^2-4x+4)=0
->(x-2)(x-2)^2=0
-> (x-2)^3=0
->x-2=0
-> x=2 .
x^3-6x^2+12x-8=0
-> x^3-2x^2-4x^2+8x+4x-8=0
-> x^2(x-2)-4x(x-2)+4(x-2)=0
-> (x-2)(x^2-4x+4)=0
->(x-2)(x-2)^2=0
-> (x-2)^3=0
->x-2=0
-> x=2 .
nha ><
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ta co tam giac ANM dong dang voi tam giac ABC
goc A chung
AN/AB=AM/AC
suy ra AN/AB=MN/BC
thay so do vao
MN=8*18/12=12cm
72367033806371673149109894141163778628811792657571658906010558390395870363798401744095280686155507736404921657070284961721828960592977909542637098897697223102622628566787654091327825453991595140205701412961364188732408936197890553699715836951569999800431957769217006743321026257517932764164662319487914962533302741368207211189494615326552790667720411285474162636765168907211924134973374304496019635376665858559941735703924836467756917247995469583487467791524582153744522107597865277798136080074161485280424274076931083994487111719562249702540362855712911132265966235754355353516703339043001506118520760359577737869472018617942120590873170710805078696371738906375721785723
4 chữ số tận cùng là 5723