1)The mass of the Sun is 2x10^33g, where 90% of it is hydrogen gas. If there are 6x10^23 hydrogen atoms in 1 g of hydrogen gas, find
(a) the mass of a hydrogen atom, correct to 3 significant figures;
(b) the number of hydrogen atoms in the Sun.
(Give the answers in scientific notation.)
2a) x^2 - 5x + 6
2b)Using the result of (a), factorize a^2 + 2ab +b^2 - 5(a+b) +6.
F.3 Mathematics
2011-01-02 6:35 am
回答 (2)
2011-01-02 7:08 am
✔ 最佳答案
1a) The mass of a hydrogen atom=1g/(6x10^23)
=1.67x10^-24g
1b) The number of hydrogen atoms in the Sun
=(2x10^33)x90%x(6x10^23)
=1.08x10^57
2a) x^2-5x+6
=(x-2)(x-3)
2b) a^2+2ab+b^2-5(a+b)+6
=(a+b)^2-5(a+b)+6
=(a-b-2)(a-b-3)
2011-01-01 23:53:46 補充：
2b) a^2+2ab+b^2-5(a+b)+6
=(a+b)^2-5(a+b)+6
=(a+b-2)(a+b-3)
2011-01-02 7:33 am
2b) a^2+2ab+b^2-5(a+b)+6
=(a+b)^2-5(a+b)+6
=(a+b-2)(a+b-3)
=(a+b)^2-5(a+b)+6
=(a+b-2)(a+b-3)
收錄日期: 2021-04-13 17:44:20
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