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куквяч
@куквяч
August 2022
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81 номер, как делать?
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litanalove
81. 1) 1/√13 =1*√13 /(√13*√13) =√13/13
2) 3/√2 =3*√2 /√2*√2 =3√2 /2 =1.5√2
3) 7/√7 =7*√7 /√7*√7 =7√7 /7 =√7
4) так же
5) также
6) 1/2√2 =√2 /(2√2*√2) =√2 /2*2 =√2/4
7,8) также как 6)
9) 4/(√3 +1) =4*(√3 -1) /(√3 +1)(√3 -1) =4(√3 -1) /(3 -1) =4(√3 -1) /2
10) 5/(√5 -2) =5(√5 +2) /(√5 -2)(√5 +2) =
=5(√5 +2) /(5 -4) =5(√5 +2)
11) 15/(√7 -√4) =15 /(√7 -2) =
=15(√7 +2) /(√7 -2)(√7 +2) =15(√7 +2) /(7 -4) =
=15(√7 +2) /3
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Answers & Comments
2) 3/√2 =3*√2 /√2*√2 =3√2 /2 =1.5√2
3) 7/√7 =7*√7 /√7*√7 =7√7 /7 =√7
4) так же
5) также
6) 1/2√2 =√2 /(2√2*√2) =√2 /2*2 =√2/4
7,8) также как 6)
9) 4/(√3 +1) =4*(√3 -1) /(√3 +1)(√3 -1) =4(√3 -1) /(3 -1) =4(√3 -1) /2
10) 5/(√5 -2) =5(√5 +2) /(√5 -2)(√5 +2) =
=5(√5 +2) /(5 -4) =5(√5 +2)
11) 15/(√7 -√4) =15 /(√7 -2) =
=15(√7 +2) /(√7 -2)(√7 +2) =15(√7 +2) /(7 -4) =
=15(√7 +2) /3