A = B
Ta có: A = ( x + y ) - ( z + t ) = x + y - z - t
B = ( x - z ) + ( y - t ) = x - z + y - t = x + y - z - t = A
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A = B
Ta có: A = ( x + y ) - ( z + t ) = x + y - z - t
B = ( x - z ) + ( y - t ) = x - z + y - t = x + y - z - t = A
cho tong A=(x+y+z)-(t+h)
trong do x,y,z,t,h la cac so nguyen khac nhau tu 1 den 2009.tim gia tri lon nhat va nho nhat
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
a, tim cac so nguyen x,y sao cho y/3 - 1/x = 1/3
b,tim cac so a va b biet a - b =5 va UCLN (a,b)/BCNN (a,b) =1/6
Luu y a/b tua la a phan b
a chia het cho b
b chia het cho a
b va a la so nguyen
so sanh a va b
a) x E U(14) va x la so nguyen to
b)(x-1)E B(33) va x co hai chu so
cho x=a/b va y=b/m voi a,b,m thuoc Z ;m>0 va x<y .Chung minh rang Z=a+b/2m thi x<Z<t
tim x,y,z la cac so nguyen
a) x-y=0,y+2z=1
b) x+y+z=7
cho a la so nguyen khong am . so sanh
(-7).a va (-10).a
cho a la so nguyen va a lon hon hoac bang 3 so sanh
15(a-3) va 11(a-3)
cho hai so a va b la hai so nguyen. tich cua a va b la 204. khi do (-a).(-b)