bài 1Tính nhanh 
\(\left(1+\dfrac{1}{12}\right)x\left(1+\dfrac{1}{13}\right)x\left(1+\dfrac{1}{14}\right)x\left(1+\dfrac{1}{15}\right)\)
bài 2 Tìm x 
\(x:\dfrac{4}{7}x\)\(\dfrac{2}{3}=2\)
bài 3 Hai ô tô chở 17 tấn 5 tạ gạo.Ô tô thứ nhất chở số gạo bằng \(\dfrac{3}{4}\)số gạo ô tô thứ 2 .Hỏi mỗi ô tô chở bao nhiêu tạ gạo ?

Giải phương trình:

a) \(x^2-\left(x+3\right)\left(3x+1\right)=9\).

b) \(x^3+4x+5=0\).

c) \(\left(x+14\right)^3-\left(x+12\right)^3=1352\).

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

e) \(x\left(x+1\right)\left(x+2\right)\left(x+3\right)=360\).

f) \(x^3+\left(x-2\right)\left(2x+1\right)=8\).

tìm x,biết:

a)\(\frac{2}{\left(x+2\right)\left(x+4\right)}+\frac{4}{\left(x+4\right)\left(x+8\right)}+\frac{6}{\left(x+8\right)\left(x+14\right)}=\frac{x}{\left(x+2\right)\left(x+14\right)}\)

b)\(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)

c)\(\left(x+2\right)^2=\frac{38}{25}+\frac{9}{10}-\frac{11}{15}+\frac{13}{21}-\frac{15}{28}+\frac{17}{36}-...+\frac{197}{4851}-\frac{199}{4950}\)

giúp tớ với,huhu

\(\text{Tìm x, biết:}\)

\(a\)) \(\left(19x+2.5^2\right):14=\left(13-8\right)^2-4^2\)

\(b\)) \(x+\left(x+1\right)+\left(x+2\right)+...+\left(x+30\right)=1240\)

\(c\)) \(11-\left(-53+x\right)=97\)

\(d\)) \(-\left(x+84\right)+213=-16\)

2. Tìm x biết:

a)2(x+2)(x+4)\dfrac{2}{\left(x+2\right)\left(x+4\right)}​ + 4(x+4)(x+8)\dfrac{4}{\left(x+4\right)\left(x+8\right)} + 6(x+8)(x+14)\dfrac{6}{\left(x+8\right)\left(x+14\right)} = x(x+2)(x+14)\dfrac{x}{\left(x+2\right)\left(x+14\right)}

b)x2023\dfrac{x}{2023}​ + x+12022\dfrac{x+1}{2022}+ x+22021\dfrac{x+2}{2021} +...+ x+20221\dfrac{x+2022}{1}​ + 2023 = 0.

Gíup mình giải 2 bài này với!

Cảm ơn các bạn rất nhiều!!!

Tìm x, biết:

\(\frac{3}{\left(x+2\right)\left(x+5\right)}+\frac{5}{\left(x+5\right)\left(x+10\right)}+\frac{7}{\left(x+10\right)\left(x+17\right)}=\frac{x}{\left(x+2\right)\left(x+17\right)}\left(x\notin-2;-5;-10;-17\right)\)

\(\frac{2}{\left(x-1\right)\left(x-3\right)}+\frac{5}{\left(x-3\right)\left(x-8\right)}+\frac{12}{\left(x-8\right)\left(x-20\right)}-\frac{1}{x-20}=-\frac{3}{4}\)

Với \(x\notin1;3;8;20\)

\(\frac{x+1}{10}+\frac{2+1}{11}\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)

\(\frac{x-10}{30}+\frac{x-14}{43}+\frac{x-5}{95}+\frac{x-148}{8}=0\)