328/435x468/432x435/164x432/984x164/468
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\(\dfrac{3}{4}+\dfrac{1}{4}:x-\dfrac{1}{2}=\dfrac{2}{3}\\ \dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{3}+\dfrac{1}{2}=\dfrac{7}{6}\\ \dfrac{1}{4}:x=\dfrac{7}{6}-\dfrac{3}{4}\\ \dfrac{1}{4}:x=\dfrac{5}{12}\\ x=\dfrac{1}{4}:\dfrac{5}{12}\\ x=\dfrac{1}{4}\cdot\dfrac{12}{5}=\dfrac{3}{5}\)
\(1\dfrac{1}{12}\left(15,75-15\dfrac{1}{4}\right)+2\dfrac{1}{12}\left(7\dfrac{3}{4}-7,25\right)\\ =\dfrac{13}{12}\left(15,75-15-0,25\right)+\dfrac{25}{12}\left(7,75-7,25\right)\\ =\dfrac{13}{12}\cdot0,5+\dfrac{25}{12}\cdot0,5\\ =0,5\cdot\left(\dfrac{13}{12}+\dfrac{25}{12}\right)\\ =\dfrac{1}{2}\cdot\dfrac{38}{12}\\ =\dfrac{19}{12}\)
4+6+8+...+x=928
Số số hạng là \(\dfrac{x-4}{2}+1=\dfrac{x-4+2}{2}=\dfrac{x-2}{2}\)
Tổng của dãy số là \(\dfrac{\left(x+4\right)\left(x-2\right)}{2}\cdot\dfrac{1}{2}=\dfrac{\left(x+4\right)\left(x-2\right)}{4}\)
Theo đề, ta có: \(\dfrac{\left(x+4\right)\left(x-2\right)}{2}=928\)
=>\(\left(x+4\right)\left(x-2\right)=928\cdot2=1856\)
=>\(x^2+2x-8-1856=0\)
=>\(x^2+2x-1864=0\)
=>\(x^2+2x+1-1865=0\)
=>\(\left(x+1\right)^2=1865\)
=>\(\left[{}\begin{matrix}x+1=\sqrt{1865}\\x+1=-\sqrt{1865}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\sqrt{1865}-1\left(loại\right)\\x=-\sqrt{1865}-1\left(loại\right)\end{matrix}\right.\)
Vậy: \(x\in\varnothing\)
1.I find ____ a useful sport for my health
a.swim b.swimming c.swimmer d.swam
2.when my father retired,he took_____ golf as a hobby to stay health
a.on b.at c.up d.in
3.Sometimes a rainbow_____after the rain.
a.appear b.appears c.not appear d.doesn't appears
4.Lan has the same hobby____Nga
a.as b.for c.of d.on
5.My father's hobby is ____stamps
a.collect b.collecting c.collector d.collection
6.I think collecting old bowls is a very____hobby
a.bore b.bored c.boring boreness
7.My uncle often gives me presents _____special occasions
a.in b.on c.of d.for
8.Do you háve a____hobby?
a.difficulty b.difficulties c.difficult d.differ
9.These gifts are made____eggshells
a.to b.for c.of d.at
Số số hạng dãy số đó là:(2024-2):2+1=1011
Tổng dãy số là:(2 + 2024) * 1012 / 2 = 1.026.028
Tổng là 1.026.028
(nêu tớ có tính sai thì cho xl trước nhé =(( )
Số số hạng của tổng \(2+4+6+8+...+2022+2024\) là:
\(\left(2024-2\right):2+1=1012\) (số)
Tổng \(2+4+6+8+...+2022+2024\) bằng:
\(\left(2024+2\right)\times1012:2=1025156\)
\(\left(2x+5\right)\left(2x-5\right)+26=4x^2\\ < =>\left[\left(2x\right)^2-5^2\right]+26=4x^2\\ < =>\left(4x^2-25\right)+26=4x^2\\ < =>4x^2-25+26=4x^2\\< =>4x^2-4x^2+1=0\\ < =>1=0\)
=> Vô lý
=> Pt vô nghiệm
63.370 + 63.82 + 37.69 + 41
= (63.370 + 63.82) + 37.69 + 41
= 63.(370 + 82) + 2553 + 41
= 63.452 + 2553 + 41
= 28476 +2553 + 41
= 31029 + 41
= 31070
`#3107.101107`
\(\dfrac{328}{435}\times\dfrac{468}{432}\times\dfrac{435}{164}\times\dfrac{432}{984}\times\dfrac{164}{468}\\=\dfrac{328\times468\times435\times432\times164}{435\times432\times164\times984\times468}\\ =\dfrac{328}{984} \\ =\dfrac{1}{3}\)