\(=20-12+5-6\)

\(=7\)

= 20 - 12 + 5 - 6

= 7

\(E=5.4-4.3+5-0,3.20=20-12+5-6=7\)

=5x4-4x3+5-6

=20-12-1

=7

\(5\sqrt{16}-4\sqrt{9}-\sqrt{25}-0,3\sqrt{400}\)

\(=5.4-4.3+5-0,3.20\)

\(=20-12+5-6\)

\(=7\)

Ta có : \(5\sqrt{16}-4\sqrt{9}+\sqrt{25}\)-0,3\(\sqrt{400}\)

= 5.4 - 4.3 + 5 - 0,3.20

= 20-12+5-6

= 9

E = 20 - 12 + 5 - 6

E = 7

Study good

\(E=5\sqrt{16}-4\sqrt{9}+\sqrt{25}-0,3\sqrt{400}\)

\(E=5\times4-4\times3+5-0,3\times20\)

\(E=20-12+5-6\)

\(E=6\)

Hok tốt

\(5\sqrt{16}-4\sqrt{9}+\sqrt{25}-\sqrt{400}\)

\(=5.4-4.3+5-20\)

\(=20-12+5-20\)

\(=-7\)

5√16−4√9+√25−√400

=5.4−4.3+5−20

=20−12+5−20

=8+5-20

=13-20

=-7

EEEEEEEEEEEEEE ĐÉ

\(\sqrt{1}-\sqrt{4}+\sqrt{9}-\sqrt{16}+\sqrt{25}-\sqrt{36}+...-\sqrt{400}\)

\(=1-2+3-4+5-6+...-400\)

\(=\left(1-2\right)+\left(3-4\right)+\left(5-6\right)+...+\left(399-400\right)\)

\(=-1+\left(-1\right)+\left(-1\right)+...+\left(-1\right)\) (200 số hạng -1)

\(=\left(-1\right).200=-200\)

a: \(C=25\cdot\dfrac{-1}{125}+\dfrac{1}{5}-2\cdot\dfrac{1}{4}-\dfrac{1}{2}\)

\(=\dfrac{-1}{5}+\dfrac{1}{5}-\dfrac{1}{2}-\dfrac{1}{2}\)

=-1

b: \(E=5\cdot4-4\cdot3+5-0.3\cdot20\)

\(=20-12+5-6=7\)

d: \(D=-8\cdot\left(\dfrac{3}{4}-\dfrac{1}{4}\right):\left(\dfrac{9}{4}-\dfrac{7}{6}\right)\)

\(=-8\cdot\dfrac{1}{2}:\dfrac{27-14}{12}\)

\(=-4:\dfrac{13}{12}\)

\(=-4\cdot\dfrac{12}{13}=-\dfrac{48}{13}\)

e: \(E=5\cdot4-4\cdot3+5-0.3\cdot20\)

=20-12+5-6

=8+5-6

=13-6=7

f: \(F=\dfrac{9}{4}+\dfrac{5}{6}-\dfrac{3}{2}:6\)

\(=\dfrac{9}{4}+\dfrac{5}{6}-\dfrac{3}{12}\)

\(=\dfrac{27}{12}+\dfrac{10}{12}-\dfrac{3}{12}=\dfrac{34}{12}=\dfrac{17}{6}\)