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; 6) (2,6 − 2,2)³ · (−1 3/4)².

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Вопрос:

Accepted Answer

\((-2)^4+3^3=16+27=43\).
\((-9)^2+(-1)^7=81-1=80\).
\(5\cdot\left(-\frac25\right)^3=5\cdot\left(-\frac{8}{125}\right)=-\frac{8}{25}\).
\((-0.4)^3+(-0.2)^3=-0.064-0.008=-0.072\).
\((8^3:200-0.4^2):(-0.5)^2=(512:200-0.16):0.25=(2.56-0.16):0.25=2.4:0.25=9.6\).
\((2.6-2.2)^3\cdot\left(-1\frac34\right)^2=0.4^3\cdot\left(-\frac74\right)^2=0.064\cdot3.0625=0.196\).

Ответ: