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minckaya1996
@minckaya1996
October 2021
1
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(11-√17)(11+√17)
(√43-5)²+10(√43-0,2)
14(1+√31)+(7-√31)²
(√2-√15)²+(√6+√5)²
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GreatFilter
(a-b)²=a²-2ab+b²
(a+b)²=a²+2ab+b²
a²-b²=(a-b)(a+b)
(11-√17)(11+√17) =11²-(√17)²=121-17=104
(√43-5)²+ 10(√43-0,2)=66
1)
(√43-5)²=(√43)² - 2*5*√43 + 5²=43-10√43+25=68
-10√43
2)
10(√43-0,2)=10
√43 - 10*0.2 =
10
√43-2
3)
68
-10√43 +
10√43-2=68-2=66
14(1+√31)+(7-√31)²=94
1)
14(1+√31)=14+
14√31
2)
(7-√31)²=7² - 2*7*√31 + (²√31)
=49-14√43+31=80-14√43
3)
14+14√31
+
80-14√43=14+80=94
(√2-√15)²+(√6+√5)²
=28
1)
(√2-√15)²=(√2)² - 2*√2*√15 + (√15)²=2-2√30+15=17-4√30
2)
(√6+√5)²=(√6)² + 2*√6*√5
+ (√5)²=6+2√30+5=11+2√30
3)
17-2√30
+11+2√30=17+11=28
2 votes
Thanks 13
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Answers & Comments
(a+b)²=a²+2ab+b²
a²-b²=(a-b)(a+b)
(11-√17)(11+√17) =11²-(√17)²=121-17=104
(√43-5)²+ 10(√43-0,2)=66
1) (√43-5)²=(√43)² - 2*5*√43 + 5²=43-10√43+25=68-10√43
2) 10(√43-0,2)=10√43 - 10*0.2 =10√43-2
3) 68-10√43 + 10√43-2=68-2=66
14(1+√31)+(7-√31)²=94
1) 14(1+√31)=14+14√31
2) (7-√31)²=7² - 2*7*√31 + (²√31)=49-14√43+31=80-14√43
3) 14+14√31+80-14√43=14+80=94
(√2-√15)²+(√6+√5)²=28
1) (√2-√15)²=(√2)² - 2*√2*√15 + (√15)²=2-2√30+15=17-4√30
2) (√6+√5)²=(√6)² + 2*√6*√5 + (√5)²=6+2√30+5=11+2√30
3) 17-2√30+11+2√30=17+11=28