Question

[Alan Becker]

a) (-2,5 0,38 . 0,4) - [0,125 . 3,15 . (-8)]

b) [(-20,83) . 0,2 + (-9,17) .0,2] : [2,47 .0,5 - (-3,53) . 0,51

Answer 1

[Nguyễn Lê Phước Thịnh]

a) Ta có: \(\left(-2.5\cdot0.38\cdot0.4\right)-\left[0.125\cdot3.15\cdot\left(-8\right)\right]\)

\(=\left(-1\cdot0.38\right)-\left[-1\cdot3.15\right]\)

\(=-0.38+3.15\)

\(=\dfrac{277}{100}\)

b) Ta có: \(\left[\left(-20.83\right)\cdot0.2+\left(-9.17\right)\cdot0.2\right]:\left[2.47\cdot0.5-\left(-3.53\right)\cdot0.51\right]\)

\(=\dfrac{0.2\left(-20.83-9.17\right)}{3.0353}\)

\(=\dfrac{0.2\cdot\left(-30\right)}{3.0353}=\dfrac{-60000}{30353}\)

Answer 2

[Alan Becker]

Thanks!