Bài 1: Rút gọn biểu thức

\(A=\frac{2^{10}.13+2^{10}.65}{2^8.104}\)  \(B=\frac{15.3^{11}+4.27^4}{9^7}\)  \(C=\left(125^3.7^5-175^5:5\right):2016^{2017}\)

Bài 2: Tìm x:

a)\(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{x.\left(x+3\right)}=\frac{6}{19}\)b)\(\left|\frac{3}{13}x^2+\frac{1}{2}\right|-\frac{3}{4}=\frac{5}{6}\)

Bài 1: Rút gọn biểu thức

\(A=\frac{2^{10}.13+2^{10}.65}{2^8.104}\)  \(B=\frac{15.3^{11}+4.27^4}{9^7}\)  \(C=\left(125^3.7^5-175^5:5\right):2016^{2017}\)

Bài 2: Tìm x:

a)\(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{x.\left(x+3\right)}=\frac{6}{19}\)b)\(\left|\frac{3}{13}x^2+\frac{1}{2}\right|-\frac{3}{4}=\frac{5}{6}\)

rút gọn

A(x)= 2\(|1-x|\) + 3(x-2) - x+1 với x >1

B(x)= -3\(|2x+5|\)- x+1 . \(|-2|\)+\(|4-5x|\)khi x <0

C(x)= \(-3|x^2+1|-3x\left(x+2\right)+|4x-2|khix>2\)

D(x)= \(-|3-x|-\left(2x+3\right)+|x-1|-2019\) khi x>3

E(x) = \(|3+x|-2.|2-x|-3x+4\)khi x<1

Rút gọn các biểu thức sau :

a) 10 x \(\frac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}\);

b) 1 + 2 + \(2^2\)+ \(2^3\)+\(2^4\)...... + \(2^{49}\)+ \(2^{50}\)

c) 5 + 5\(^3\)+ 5\(^5\)+......+ 5\(^{47}\)+ 5\(^{49}\).