Fast use the rounding method to approximate the following numbers according to the requirements and express them with scientific notation: Use the rounding method to approximate the following numbers according to the requirements, and use the scientific counting method to express them: (1) From the launch of the space probe "Pioneer 10" to the time when people received its last signal in February 2003, it had already flown 12 200 000 km away from the earth (with two significant numbers reserved); (2) June 5, 2005 is the 34th World Environment Day. At present, the total ocean area in the world is about 361059000 km2 (three valid figures are reserved); (3) In 2003, China's gross domestic product (GDP) was 11669.4 billion yuan; (4) Light year is the unit of distance in astronomy. One light year is about 9 500 000 km (accurate to 100 million bits); (5) The annual power consumption of street lighting in a city is about 42 million kW / h (accurate to one million kW / h) This is the first day of junior high school

(1) 1.2×10^10 Km
(2) 3.61×10^8 Km²
(3) 1.167 × 10 ^ 13 yuan
(4) 9.5000×10^12 Km
(5) 4.2×10^7 KwH