1.提示:(1)64. (2)-15.625. (3)-0.0081. (4)-0.16. (5)81/256. (6)1000000.
2.提示:(1)25. (2)169. (3)625. (4)1681.
3.解:(1)-3²-(-3)³+(-2)²=-9-(-27)+4-8=-9+27+4-8=14.
(2)-18÷(-3)^3=-18÷9=-2.
4.解:(1)36000000=3.6×〖10〗^7. (2)696000000=6.96×〖10〗^8. (3)1738000=1.738×10×^7. (2)696000000=6096×10⁸. (3)1738000=1.738×10^6. (4)16000000=1.6×〖10〗^7.
5.解:12200000000=1.22×10^10(km).
6.解:(1)2^21=2097152(根). (2)面条总长度为2^21×1.29=2705326.08(米),能超过珠穆朗玛峰的高度.
7.提示:167676+10×2π×(6400+343)≈5.911364×〖10〗^5 (km).