Use the method of rounding, take the approximate value of each number according to the requirements, and use the scientific counting method to express 12 200 000 000 (keep 2 significant figures) 361059000 (keep three significant figures) 11669.4 billion (keep 4 significant figures) 9500 (accurate to 100 million bits) 42 million (to the nearest million)

Use the method of rounding, take the approximate value of each number according to the requirements, and use the scientific counting method to express 12 200 000 000 (keep 2 significant figures) 361059000 (keep three significant figures) 11669.4 billion (keep 4 significant figures) 9500 (accurate to 100 million bits) 42 million (to the nearest million)


1.2*10^10
3.61 * 104000 = 3.61 * 104000
167 * 10 ^ 5 million = 167 * 10 ^ 13 million
9.5000 * 10 ^ 12 = 9.5 * 10 ^ 4 billion
4.2 million = 4.2 * 10 ^ 7