Question

tính (nhanh nếu có thể)

a)\(5.2^4+2.3^3-3,4\)

b)\(\dfrac{\dfrac{1}{3}-0,25+0,2}{1\dfrac{1}{6}-0,875+0,7}\)

Answer 1

a) \(5.2^4+2.3^3-3,4\)

\(=5.2.2^3+2.3^3-3,4\)

\(=2.40+2.27-3,4\)

\(=2\left(40+37\right)-3,4\)

\(=2.77-4,3\)

\(=154-4,3=149,7\)

b) \(\dfrac{\dfrac{1}{3}-0,25+0,2}{1\dfrac{1}{6}-0,875+0,7}=\dfrac{2\left(\dfrac{1}{6}-0,125+\dfrac{1}{10}\right)}{7\left(\dfrac{1}{6}-0,125+\dfrac{1}{10}\right)}=\dfrac{2}{7}\)

Answer 2

a. \(5.2^4+2.3^3-3,4\)

\(=5.2^3.2+2.27-3,4\)

\(=2.\left(40+27\right)-3,4\)

\(=2.67-3,4\)

= 134 - 3,4 = 130,6