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4678×4679+4680×314648=1494441002
4680×4679-4678×4679=9358
![](https://rs.olm.vn/images/avt/0.png?1311)
y × 10 = 140 , 2 → y = 14 , 02 1 , 402 : y = 10 → y = 0 , 1402 100 × y = 140 , 2 → y = 1 , 402 y : 10 = 14 , 02 → y = 140 , 2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) y = 14 , 02
b) y = 0 , 1402
c) y = 1 , 402
d) y = 140 , 2
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y:5%+y:25%+y:0.2-y*10=100
y:5/100+y:25/100+y*5-y*10=100
y*20+y*4+y*5-y*10=100
y*(20+4+5-10)=100
y*19=100
y=100:19
y=100/19
tick mình đấy nhé
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a) 1,28:0,125+1,28×0,25+1,28×1,75
=1,28x(8+0,25+1,75)
=1,28x10=12,8
b) bạn nên viết rõ ra
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\(\frac{4678\times4679+4680\times31+4648}{4680\times4679-4678\times4679}\)
\(\Leftrightarrow\frac{4679\times4678+4679\times31+4679}{4679\times\left(4680-4678\right)}\)
\(=\frac{4679\times\left(4678+31+1\right)}{4679\times2}\)
\(=\frac{4679\times4710}{4679\times2}\)
\(=\frac{4710}{2}\)
\(=2355\)
\(\frac{4678\cdot4679+4680\cdot31+4648}{4680\cdot4679-4678.4679}\)=\(\frac{4678\cdot4679+\left(4680-1\right)\cdot31+4648+31}{4680\cdot4679-4678.4679}\)
=\(\frac{4678\cdot4679+4679\cdot31+4679}{4680\cdot4679-4678.4679}\)=\(\frac{\left(4678+31+1\right)\cdot4679}{\left(4680-4678\right).4679}\)=\(\frac{4710}{2}\)=2355
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Ta có \(\hept{\begin{cases}\left(2x-3\right)^{10}\ge0\forall x\\\left[100\left(x+2y\right)\right]^{100}\ge0\forall x;y\end{cases}}\)
Dấu "=" xảy ra <=> \(\hept{\begin{cases}2x-3=0\\x+2y=0\end{cases}}\Rightarrow\hept{\begin{cases}x=1,5\\y=-0,75\end{cases}}\)
Vậy x = 1,5 ; y = -0,75
\(\left(2x-3\right)^{10}+\left(x+2y\right)^{100}\le0\)
Ta có: \(\left(2x-3\right)^{10}\)và \(\left(x+2y\right)^{100}\) là số chính phương. => \(\left(2x-3\right)^{10}\ge0;\left(x+2y\right)^{100}\ge0\)
Mà \(\left(2x-3\right)^{10}+\left(x+2y\right)^{100}\le0\)
=> \(\left(2x-3\right)^{10}=0;\left(x+2y\right)^{100}=0\)
=> 2x - 3 = 0; x + 2y = 0. => x = 3/2; y = -3/4.
Bạn Tham khảo `1` bài này nhé!
Y=52