Tinh gia tri cua cac bieu thuc sau bang cach hop li
a) 125 : (-61) . (-23) . (-1) 2n
b) 136 . (-47) + 36 . 47
Tinh hop li
(-48). 72 + 36 . (-304)
125 . (-61) . (-2)^3 . (-1)^2n (n thuoc N)
Giai theo cach quy tac chuyen ve
TINH GIA TRI BIEU THUC ko tim n tinh bieu thuc
125.(-61):(-2)^3:(-1)^2n (nTHUOC N*)
tinh gia tri cac bieu thuc sau theo cach hop li nhat
A=25.(4-300)
B=83.35-35.183
1) Tim tat ca cac uoc chung cua hai so tu nhien lien tiep .
2) Tim tat ca cac uoc chung cua 5n + 6 va 8n + 7 (n thuoc N)
3)Mot khoi hoc sinh xep hang 4 , hang 5 ,hang 6 deu thua 1nguoi nhung xep hang 7 thi vua du .Biet so hs chua den 400 nguoi .Tinh so hs
4)Goi X la tap hop cac hoc sinh thich ca hat cua lop 6A .Tap hop Y la tap hop cac hoc sinh thic da bong cua lop 6A .Tap hop X giao Y bieu thi tap hop nao.
Tinh cac tong sau day mot cach hop li:
a) A= 1+ 5+ 52+ 53+........+ 51998
b) B= 1+ 4+ 42 + .................+ 4 n
Cac ban giup minh 5 bai toan nay nhe , minh dang can gap!
1/ An va Binh moi nguoi mua mot so hop but chi mau , trong moi hop deu co tu ba but tro len va so but o cac hop deu bang nhau. Tinh ra An mua 20 but , Binh mua 15 but. Hoi moi hop but chi mau co bao nhieu chiec va moi ban da mua bao nheu hop but chi mau ?
2/ a) Tim x thuoc N, biet x chia het cho 25 va 45 va 300 < x < 500
b) Tim x thuoc Z, biet gia tri tuyet doi cua x - (- 15) = 60
3/ ( Bai toan thuc te )
Mot nha kinh doanh nam dau tien lai 20 trieu dong, nam thu 2 lo 43 trieu dong, nam thu 3 lai 65 trieu dong. Hoi so von cua nha kinh doanh tang bao nhieu trieu dong sau 3 nam kinh doanh.
4/ Tren tia Ax lay hai diem B va C sao cho AB = 3 cm ; AC = 9cm
a) Tinh BC
b) Tren tia doi cua tia Ax lay diem M sao cho AM = 3 cm . Tinh MB
c) Goi K la trung diem BC so sanh cac doan thang BK va AM.
5/ Tim so tu nhien n sao cho 2n + 5 chia cho n + 1.
Cac ban hay giup minh nha!
1) cho tap hop A={x=a2/a=2k,k thuoc N va 0<a<10} va tap hop B={y thuoc N/y=b^3, b thuoc N}
a)vi\et A va B duoi dang liet ke
b)viet tat ca cac tap hop con cua tap hop A
c)viet tap hop D={x thuoc N/x:64=1} chung to B=D
cac ban co gang giai nhanh giup minh !!thanks
Cho A la tap hop cac so tu nhien lon hon 50va nho hon 100.Viet tap hop A bg cach chi ra cac tinh chat dc trung cho cac phan tu cua no
cho B ={50;51;52...97;98;99 } .dung 1 trong cac ki hieu
thuoc;kg thuoc;bg; tap hop con de bieu dien moi quan he giua 2 tap hop A va B
b] Tap hop A co bao nhieu phan tu? tim tg tat ca cac so la phan tu cua tap hop A