tính nhanh:
\(\dfrac{88986x2003-678}{88985x2003+1325}\)
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Killua Zoldyck sai nhé xem tui làm nà
\(=\frac{\left(88985+1\right)\times2003+-678}{88985\times2003+1325}\)
\(=\frac{88985\times2003+2003-678}{88985\times2003+1325}\)
\(=\frac{88985\times2003+1325}{88985\times2003+1325}\)
\(=1\)
Bài 2:
a: =47,4+47,4x4=47,4x5=237
b: =(0,26+0,74)+(0,41+0,59)=1+1=2
đây là đề \(\frac{88986\times2003-678}{88985\times2003+1325}\)
\(\frac{1-678}{1+1325}=\frac{-677}{1326}\)
chúc bạn học tốt nhé
:D
\(\frac{88986.2003-678}{88986.2003+1325}\)
\(=\frac{88986.2003+1325-2003}{88986.2003+1325}\)
\(=1-\frac{2003}{88986.2003+1325}\)
... bn tự tính nghen!!!
678 x 678 + 302 x 678 + 678 + 678 : 2
=678 x 678 + 302 x 678 + 678 + 678 x 0,5
=678 x (678+302+1+0,5)
=678 x 981,5
= 665457
6783 + 1325 = 8108
1 + 434566433635 = 434566433636
45 + 23 =68
K CHO MK NHA THANK YOU VERY MUCH
\(4\cdot\left(-\dfrac{1}{2}\right)^{^3}+2\cdot\left(-\dfrac{1}{2}\right)^{^2}+3\cdot\left(-\dfrac{1}{2}\right)+1=\left(-\dfrac{1}{2}\right)\left[4\cdot\left(-\dfrac{1}{2}\right)^{^2}+2\left(-\dfrac{1}{2}\right)+3\right]+1=\left(-\dfrac{1}{2}\right)\left(4\cdot\dfrac{1}{4}-1+3\right)+1=\left(-\dfrac{1}{2}\right)\left(1-1+3\right)+1=3\left(-\dfrac{1}{2}\right)+1=-\dfrac{3}{2}+1=-\dfrac{1}{2}\)
Vì \(\left(x-\dfrac{1}{5}\right)^{2004}\ge0,\left(y+0,4\right)^{100}\ge0,\left(z-3\right)^{678}\ge0\)
\(\Rightarrow\left(x-\dfrac{1}{5}\right)^{2004}+\left(y+0,4\right)^{100}+\left(z-3\right)^{678}\ge0\)
Dấu "=" xảy ra \(\Leftrightarrow\left\{{}\begin{matrix}x-\dfrac{1}{5}=0\\y+0,4=0\\z-3=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{1}{5}\\y=-0,4\\z=3\end{matrix}\right.\)
Vậy \(\left(x,y,z\right)=\left(\dfrac{1}{5};-0,4;3\right)\)
Vì \(\left(x-\dfrac{1}{5}\right)^{2004}\ge0\forall x\)
\(\left(y+0,4\right)^{100}\ge\forall y\)
\(\left(z-3\right)^{678}\ge0\forall z\)
\(\Rightarrow\left(x-\dfrac{1}{5}\right)^{2004}+\left(y+0,4\right)^{100}+\left(z-3\right)^{678}\ge0\)
mà \(\left(x-\dfrac{1}{5}\right)^{2004}+\left(y+0,4\right)^{100}+\left(z-3\right)^{678}=0\)
Dấu ''='' xảy ra khi \(x=\dfrac{1}{5};y=-0,4;z=3\)
`= (88985 xx 2003 + 2003 - 678)/(88985xx2003+1325)`
`= (88985 xx 2003 + 1325)/(88985 xx 2003 + 1325)`
`= 1.`
khó thế nhỉ