48. Вычислите: 1) (−2)^4 + 3^3; 2) (−9)^2 + (−1)^7; 3) 5 · (−2/5)^3; 4) (−0,4)^3 + (−0,2)^3; 5) (8^3 : 200 − 0,4^2) : (−0,5)^2; 6) (2,6 − 2,2)^3 · (−1 3/4)^2.

1. \((-2)^4+3^3=16+27=43\).
2. \((-9)^2+(-1)^7=81-1=80\).
3. \(5\cdot\left(-\frac25\right)^3=5\cdot\left(-\frac8{125}\right)=-\frac8{25}\).
4. \((-0.4)^3+(-0.2)^3=-0.064-0.008=-0.072\).
5. \(\left(8^3:200-0.4^2\right):( -0.5)^2=(512:200-0.16):0.25=(2.56-0.16):0.25=2.4:0.25=9.6\).
6. \((2.6-2.2)^3\cdot\left(-1\frac34\right)^2=0.4^3\cdot\left(-\frac74\right)^2=0.064\cdot\frac{49}{16}=0.196\).

Ответ: 1) 43; 2) 80; 3) \(-\frac8{25}\); 4) −0,072; 5) 9,6; 6) 0,196.