請計√a+b
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更新1:
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F.2數學
回答 (5)
2007-06-15 7:39 pm
✔ 最佳答案
√a=0.3a = 0.09
√b=0.4
b = 0.16
√(a+b) = √(0.09+0.16)
=√0.25
=0.5
2007-06-15 7:42 pm
√a=0.3
a=0.09
√b=0.4
b=0.16
√a+b
=√0.09+0.16
=√0.25
0.5
a=0.09
√b=0.4
b=0.16
√a+b
=√0.09+0.16
=√0.25
0.5
2007-06-15 7:42 pm
√a=0.3,√b=0.4,
a=0.09, b=0.16, a+b=0.25
√a+b=0.5
or
(√a+√b)^2=0.49
(√a+√b)^2=a+b+2√a√b
a+b=(√a+√b)^2-2√a√b
=0.49-2(0.3)(0.4)=0.49-0.24=0.25
a+b=0.25
√a+b=0.5
a=0.09, b=0.16, a+b=0.25
√a+b=0.5
or
(√a+√b)^2=0.49
(√a+√b)^2=a+b+2√a√b
a+b=(√a+√b)^2-2√a√b
=0.49-2(0.3)(0.4)=0.49-0.24=0.25
a+b=0.25
√a+b=0.5
收錄日期: 2021-04-23 22:08:57
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070615000051KK01000