ko có

kb vs mk

tk mk nha

Bài làm văn tả ma đi.Mình k ở đây luôn nha.3 k nếu hay vs dài.

- Chỉ cần k Đúng Cho Mk Thôi ~~

Văn tả body của mình được hơm ?

hiện nay trong nhà trg có hiện tượng nói chuyện riêng trong giò học.Vừa vi phạm nội quy, vừa làm ảnh hưởng tới học tập.E hãy viết một bài văn khoảng 2 trang giấy thi để phản ảnh về hiện tượng này .

Làm giúp mk vs

mgu

a: \(A=3+3^2+\cdots+3^{2019}\)

=>\(3A=3^2+3^3+\ldots+3^{2020}\)

=>3A-A=\(3^2+3^3+\cdots+3^{2020}-3-3^2-\cdots-3^{2019}\)

=>2A=\(3^{2020}-3\)

=>2A+3=\(3^{2020}\)

=>\(3^{x}=3^{2020}\)

=>x=2020

b: ƯCLN(a;b)=5

=>a⋮5 và b⋮5

ab=300

mà a⋮5 và b⋮5

nên (a;b)∈{(5;60);(60;5);(10;30);(30;10);(15;20);(20;15)}

mà ƯCLN(a;b)=5

nên (a;b)∈{(5;60);(60;5);(15;20);(20;15)}

\(\left(2x+3\right)^3=\left(-25\right).\left(-5\right)\)

\(\Leftrightarrow\left(2x+3\right)^3=125\)

\(\Leftrightarrow\left(2x+3\right)^3=5^3\)

\(\Leftrightarrow2x+3=5\)

\(\Leftrightarrow2x=2\)

\(\Leftrightarrow x=1\)

\(\left(2x+3\right)^3=\left(-25\right).\left(-5\right)\)

\(\Leftrightarrow\left(2x+3\right)^3=5^3\)

\(\Leftrightarrow2x+3=5\)

\(\Leftrightarrow2x=2\)

\(\Leftrightarrow x=1\)

\(\Leftrightarrow x\left(y+1\right)+y+1=31\\ \Leftrightarrow\left(x+1\right)\left(y+1\right)=31=31\cdot1\)

\(TH_1:\left\{{}\begin{matrix}x+1=31\\y+1=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=30\\y=0\end{matrix}\right.\rightarrow\left(30;0\right)\\ TH_2:\left\{{}\begin{matrix}x+1=1\\y+1=31\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0\\y=30\end{matrix}\right.\rightarrow\left(0;30\right)\)

Vậy \(\left(x;y\right)\in\left\{\left(30;0\right);\left(0;30\right)\right\}\)

\(\Leftrightarrow xy+x+y+1=31\Leftrightarrow\left(x+1\right)\left(y+1\right)=31\)

Do x, y nguyên dương nên xảy ra các TH sau:

TH1: \(\left\{{}\begin{matrix}x+1=1\\y+1=31\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\y=30\end{matrix}\right.\)(LOẠI)

TH2:\(\left\{{}\begin{matrix}x+1=31\\y+1=1\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x=30\\y=0\end{matrix}\right.\)(LOẠI)

Vậy không có x, y nguyên dương thoả mãn đề bài.

25) How can strong earthquakes affect land features? Strong earthquakes can cause the ground to crack or shift, create landslides, trigger tsunamis, and permanently raise or lower sections of the Earth's crust (uplift and subsidence).

26) Explain what happens when locked slabs break free. When locked tectonic slabs suddenly break free, the stored elastic energy is released as seismic waves, causing the ground to shake (an earthquake).

27) What can cause weathering? Weathering is caused by physical forces (like ice wedging, plant roots, and temperature changes) and chemical processes (like water reacting with minerals, acid rain, or oxidation).

28) How does erosion shape and change the land? Erosion picks up and moves weathered rock and soil to new locations. This process wears down mountains, carves out valleys and canyons, and creates new landforms like deltas through deposition.

29) How does gravity cause erosion? Gravity acts as a direct force that pulls rocks, soil, and debris downward, leading to mass movements such as landslides, mudslides, rockfalls, and soil creep.