( 2 x X + 1 )2 = 625
( 2 x X + 1 ) 2 = 252
2 x X + 1 = 25
2 x X = 24
x = 12
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Bai 1: a)Tim so tu nhien a biet 1960va2002 chia cho a cung co so du la 28b)Tim 2 sop tu nhien a va b , biet :BCNN(a,b)300;UCLN(a,b)15 va a+15bBai 2:a)Tong sau la binh phuong so nao ?S1+3+5+7+...+199b) Cho so ab va so ababab 1)chung to ababab la boi cua ab2)So 3 va 10101 co phai la uoc cua ababab khong , vi sao?Bai 3a)Hay viet them dang sau so 664 ba chu so de nhan duoc sdo co 6 chu so chia het cho 5,9,11b)Tim so nguyen x thuoc Z biet rang :(x^2-1)(x^2-4)0Bai 4 :tim so nguyen x va y biet: xy-x+2...
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Bai 1: a)Tim so tu nhien a biet 1960va2002 chia cho a cung co so du la 28
b)Tim 2 sop tu nhien a va b , biet :BCNN(a,b)=300;UCLN(a,b)=15 va a+15=b
Bai 2:a)Tong sau la binh phuong so nao ?
S=1+3+5+7+...+199
b) Cho so ab va so ababab
1)chung to ababab la boi cua ab
2)So 3 va 10101 co phai la uoc cua ababab khong , vi sao?
Bai 3
a)Hay viet them dang sau so 664 ba chu so de nhan duoc sdo co 6 chu so chia het cho 5,9,11
b)Tim so nguyen x thuoc Z biet rang :
(x^2-1)(x^2-4)<0
Bai 4 :tim so nguyen x va y biet: xy-x+2y=3
tim x thuoc n biet ;
g/121 :11-(4 nhan x cong 5) chia 3 =4
h/2x cong 2x+1 = 96
k/34 nhan x +4 =81 x+3
j/(x -5)7=(x-5)9 chu y x nho hon hoac bang 5
l/x2015 =x2016
biet a=22 nhan 34 voi x,y thuoc N* va a co 9 uoc. Tim a
Cho a la so co 2 chu so tim a biet rang tong 2 chu so cua a cong them binh phuong cua tong 2 chu so do se duoc a.