Đáp án: ( căn 10 + căn 2 ) * căn của 3 - căn 5 - Đáp án 4 Giải thích các bước giải (√(10)+√(2))√(3-√(5)) =(√(5)+1)√(2)√(3-√(5)) =(√(5)+1)√(6-2√(5)) =(√(5)+1)√((√(5))^2-2√(5)1+1^2) =(√(5)+1)√((√(5)-1)^2) =(√(5)+1)∣√(5)-1∣ =(√(5)+1)(√(5)-1) =(√(5))^2-1^2 =5-1 =4

Đáp án 4 Giải thích các bước giải (√(10)+√(2))√(3-√(5)) =(√(5)+1)√(2)√(3-√(5)) =(√(5)+1)√(6-2√(5)) =(√(5)+1)√((√(5))^2-2√(5)1+1^2) =(√(5)+1)√((√(5)-1)^2) =(√(5)+1)∣√(5)-1∣ =(√(5)+1)(√(5)-1) =(√(5))^2-1^2 =5-1 =4

Đáp án Đáp án (√(10)+√(2))√(3-√(5)) =(√(5)+1)√(6-2√(5)) =(√(5)+1)√((√(5))^2-2√(5)1+1^2) =(√(5)+1)√((√(5)-1)^2) =(√(5)+1)(√(5)-1) =(√(5))^2-1^2 =4

conghaoxuan74

3 tháng trước

( căn 10 + căn 2 ) * căn của 3 - căn 5

Xem đáp án

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2 câu trả lời

chinhphuctatca

3 tháng trước

Đáp án:

`4`

Giải thích các bước giải:

`(\sqrt{10}+\sqrt{2})\sqrt{3-\sqrt{5}}`

`=(\sqrt{5}+1).\sqrt{2}.\sqrt{3-\sqrt{5}}`

`=(\sqrt{5}+1).\sqrt{6-2\sqrt{5}}`

`=(\sqrt{5}+1).\sqrt{(\sqrt{5})^2-2.\sqrt{5}.1+1^2}`

`=(\sqrt{5}+1).\sqrt{(\sqrt{5}-1)^2}`

`=(\sqrt{5}+1).|\sqrt{5}-1|`

`=(\sqrt{5}+1)(\sqrt{5}-1)`

`=(\sqrt{5})^2-1^2`

`=5-1`

`=4`

trunghieu777

3 tháng trước

Đáp án:

`(\sqrt{10}+\sqrt{2})\sqrt{3-\sqrt{5}}`

`=(\sqrt{5}+1).\sqrt{6-2\sqrt{5}}`

`=(\sqrt{5}+1).\sqrt{(\sqrt{5})^2-2.\sqrt{5}.1+1^2}`

`=(\sqrt{5}+1).\sqrt{(\sqrt{5}-1)^2}`

`=(\sqrt{5}+1)(\sqrt{5}-1)`

`=(\sqrt{5})^2-1^2`

`=4`

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