Rút gọn :
A= ( 2 . 8^4 . 27^2 + 4 . 6^9 ) : ( 2^7 . 6^7 + 2^7 . 40 . 9^4 )
B= ( (2/3)^3 . (-3/4)^2 . (-1)^5 ) : ( ( 2/5)^2 . ( -5/12)^ 3
Rút gọn
1) (0.9)^5/(0.3)^6
2)20^5*5^410/100^5
3)4^6*9^5+6^9*120/8^4*3^12-6^11
4)4^2*25^2+32*125/2^3*5^2
Rút gọn: A=(3/2-2/5+1/10)/(3/2-2/3+1/12)
Bài 1. Tìm \(x\).
a) -5(\(x\)2-3\(x\)+1)+\(x \)(1+5\(x\))=\(x-2\)
b) \(12x\)2\(-4x\)\((3x+5)\)\(=10x-17\)
c) \(-4x(x-5)+7x(x-4)-3x\)2\(=12\)
Bài 2. Tính ( Rút gọn).
a) \((x+5).(x-7)-7x.(x-3)\)
b) \(x.(x\)2\(-x-2)-(x-5).(x+1)\)
c) \((x-5).(x-7)-.(x+4).(x-3)\)
d) \((x-1).(x-2)-(x+5).(x+2)\)
rút gọn \(\frac{2^{12}.3^5-4^6.9^2}{\left(2^2.3\right)^6+8^4+3^5};\frac{5^{10}.7^3-2565.49^2}{\left(125.7\right)^3+5^9+14^3}\)
Rút gọn biểu thức A= \(\frac{\left(\frac{2}{3}\right)^3\cdot\left(-\frac{3}{4}\right)^2\cdot\left(-1\right)^{2017}}{\left(\frac{2}{5}\right)^2\cdot\left(-\frac{5}{12}\right)^3}-\frac{71}{5}\)
Rút gọn biểu thức:
\(\frac{2^{12}.3^5-4^6.9^2}{\left(2^2.3\right)^6+8^4.3^5}-\frac{5^{10}.7^3-25^5.49^2}{\left(125.7\right)^3+5^4.14^3}\)
Rút gọn theo cách hợp lí
\(\left(\frac{2}{3}\right)^3.\left(\frac{-3}{4}\right)^2.\left(-1\right)^5\) : \(\left(\frac{2}{5}\right)^2.\left(\frac{-5}{12}\right)^3\)
Rút gọn biểu thức
a)\(\frac{\left(\frac{2}{3}\right)^3.\left(-\frac{3}{4}\right)^2.\left(-1\right)^5}{\left(\frac{2}{5}\right)^2.\left(-\frac{5}{12}\right)^2}\)
b)\(6^6+6^3.3^3+3^6\)/-73
