ba - ab =27
10b + a - 10a - b = 27
9b - 9a =27
9(b-a)=27
b-a=3
Do đó \(9\left(b-a\right)=9.3=27\)
ba - ab =27
10b + a - 10a - b = 27
9b - 9a =27
9(b-a)=27
b-a=3
Do đó \(9\left(b-a\right)=9.3=27\)
1+2+3+...+2001+2002
CAC BAN CO THE GIAI CHO MINH VI SAO SO HẠNG LAI LA 1001 .CAC BAN GIAI THICH RA CHO MINH VOI
1)trong dieu tra so thich cua 100 hoc sinh THCS nguoi ta thay co 80 hoc sinh thich hoat dong the duc ,65 hoc sinh thich hoat dong am nhac
a)neu co 5 ban khong thich cac the thao lan am nhac thi co bao nhieu ban thich cac the thao lan am nhac
b)co nhieu nhatco nhieu nhat bao nhieu hoc sinh thich ca the thao va am nhac?
c)co it nhat bao nhieu hoc sinh thich ca the thao va am nhac
2)tim hieu nguyen vong trong lop 6A co 45 hoc sinh thich tham gia ngoai khoa thay chu nhiem cho biet co 21 hoc sinh thich boi loi,18 hoc sinh thich bong ro va 26 hoc sinh thich choi co vua trong so cac hoc sinh do co 12 hoc sinh thich ca co vua va boi loi,9 hoc sinh thich ca bong ro va co vua 5 hoc sinh thich ca boi loi va bong ro,co 3 hoc sinh thich ca co vua boi loi va bong ro hoi
a)co bao nhieu hoc sinh khong thich mon nao
b)co bao nhieu hoc sinh chi thich 1 mon
cac ban co gang giai nhanh dum minh
3 ban an ,bac,cuong dung co dinh mot cay sao thang dung roi danh dau chieu cao cua cac ban len do boi ba diem .cuong dat ten cho cac diem do theo thu tu tu duoi len la a,b,c va giai thich la diem a ung voi chieu cao cua ban an b ung voi chieu cao cua ban bac va c ung voi chieu cao cua ban cuong biet rang ban an cao 150 cm,ban bac cao 153 cm ban cuong cao 148 cm.theo em,cuong giai thich nhu the co dung khong hoi neu khong phai sua nhu the nao cho dung.
1, tinh cac gia tri cac bieu thuc sau mot cach hop li;
a,27+73-30:(25-10)
133.(33+20)-33.(133+20)
(15^2015+15^2016):15^2015
2,tim so nguyen x biet
2x-4=-18
(x+1)^3=27
13-(x-2)=11
3,nguoi ta to chuc phat qua cho cac em nho nhan dip tet trung thu gom co 133goibanh,80goi keo,170hop mut duoc chia deu vao cac phan qua.nhung khi chia thi thi con thua 13 goi banh ,8goi keo va 2 hop mut khong chia duoc cac phan qua.hoi nguoi ta da phat qua duoc nhieu nhat bao nhieu ban nho
4,tren tia ax,ve cac diem b,c sao cho ac=4,ab=8.
a,hoi trong 3 diem a,b,c diem nao nam giua 2diem con lai .
b,diem c co phai la trung diem cua doan thang ab khong . vi sao
5, tinh tong a=6+18+36+60+.........+29700+30300
mong cac ban se giup minh nhe ban nao giup minh se like cho nhieu cai va nho co loi giai phep tinh dang hoang nha i love you
.
Khi chia so a cho 18 ta duoc so du la 6. Hoi:
a) so a co chia het cho 6 khong?
b) so a co chia het cho 9 khong?
Cac ban nho giai thi ghi cach lam ra dum minh nha can gap lam do!!!!!!
tim cac so tu nhien a , b c sao cho :
a+ b + c =abc va a > b > c > 0 ( a , b , c la 1 so tu nhien co 1 hoac nhieu chu so ! )
ban nao lam dung minh tk cho nhe !
the nay cac ban hieu chua !
lam lai ho minh nhe !
1.a. thay chu so thich hop vao dau *de dc hop so: *27
bphan tich cac hop so da tim dc ra thua so ng to
c. tim x thuoc N, biet:
c1: 327 chia het cho x
c2: 327la boi so cua x+12
c3: 327 chia het cho (2.x)
c. tim a,b thuoc N, a<b biet a.b=327
4. a) tong cua 25 SNT nho hon 100 la so chan hay so le?
b) tong cua 2 so NT co the = 999 dc ko? vi sao?
c) tong cua 2 so NT co the = 2007 dc ko? vi sao?
d) tong cua 3 so NT = 1012. tim so nho nhat
ban nao tra loi dung va chi tet minh cho 1 like
ne mik noi ne SNT la so nguyen to
thoi thi giai dung cau naao cung dc minh cung cho like
Cau 3:Giai thich tai sao :
a/so co 4 chu so xyxy khi chia cho so 2 chu so xy lai co thuong la 101.
b/so co 6 chu so xyvxyv khi chia so co 3 chu so xyv lai co thuong la 1001
ban co the giai thich cho toi tai sao la[ n.(n+1)]:2 lai la tong ko?