3<3^x<234
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Mở điện thoại và cài phần mềm PhotoMath, nó sẽ cho bạn lời giải và đáp án. Nếu thắc mắc cách dùng thì seach google nha.
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a, A= { 36;40;44;........;228}
Số các phần tử là ( 228 - 36) : 4 +1= 49( số hạng)
tổng các phần tử là: ( 228+36) x 49 :2=6468
Phần b cũng vậy mà làm nhé
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Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3
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Vì 180:x ; 234:x nên=> x là Ư của 180 và 234
Ta có 180=2^2x3^3x5
234=2x3^2x13
UCLN(180,234)=2x3^2=18
Vì UCLN(180,234)=18 nên UC(180,234)=18
U(18)=(2,3,6,9,18)
Vì 6<x<10 nên x=9
Vậy x=9
Nkớ **** nka
3 < 3x < 234
31 < 3x < 234
1< x < log3234
3<3^x<234
=> x = { 2 ; 3; 4 }
như vậy thì ta sẽ được kết quả là: 3 < 9 < 234 ; 3 < 27 < 234 ; 3 < 81 < 234