2. Вычислите: 1) (−2)⁴ + 3³; 2) (−9)² + (−1)⁷; 3) 5 · (−2/5)³; 4) (−0,4)³ + (−0,2)³; 5) (8³ : 200 − 0,4²) : (−0,5)².

Question

Вопрос:

Accepted Answer

1) \((-2)^4+3^3=16+27=43\).

2) \((-9)^2+(-1)^7=81-1=80\).

3) \(5\cdot\left(-\frac{2}{5}\right)^3=5\cdot\left(-\frac{8}{125}\right)=-\frac{40}{125}=-\frac{8}{25}\).

4) \((-0.4)^3+(-0.2)^3=-0.064-0.008=-0.072\).

5) \((8^3:200-0.4^2):(-0.5)^2=(512:200-0.16):0.25=(2.56-0.16):0.25=2.4:0.25=9.6\).

Ответ: 1) 43; 2) 80; 3) \(-\frac{8}{25}\); 4) −0,072; 5) 9,6.