Chi mai mua 1 so bong hong vang va do het 130000 dong. Neu chi Mai mua so bong hong vang bang dung so hong do da mua va mua so hong do bang dung so hong vang da mua thi chi phai tra it hon 4000 dong. Tinh so hong vang chi Mai da mua biet moi bong hong do gia 5000 dong, moi bong hong ang gia 3000 dong
Nha truong da mua mot so ghe, moi cai gia 350000 dong va mua mot so ban, moi cai gia 600000 dong, phai tra tat ca 8300000 dong.Neu nha truong mua so ban bang so ghe da mua va mua so ghe bang dung so ban da mua thi phai bu them 500000 dong nua Tinh so ban va so ghe nha truong da mua.
bac lan mua mot so qua trung gom trung ga va trung vit het tat ca 175000 dong gia moi qua trung ga la 3000dong gia moi qua trung vit la 2500 dong .Hoi lan da mua bao nhieu qua trung ga biet neu bac doi so trung ga lay so trung vit ban dau ma so trung vit bang so trung ga ban dau thi bac phai them 7500 dong
2 ban hong va hue co tong so tien la 76000 dong biet 3/5 so tien cua hong bang2/3 so tien cua hue . hoi moi ban co bn tien
Hong co 7 to giay mau . Hong lay ra mot so to va cat moi to thanh 5 to nho . Sau do Hong lai lay mot so to dem cat moi to thanh 5 to nho. Va cu tiep tuc nhu the mot lan nua . Cuoi cung Hong ngoi dem lai thi thay co tat ca 184 to nho lon khac nhau. Hoi Hong dem dung hay sai ? Tai sao?
BAN MAI DUNG 25 000 DONG MUA BUT .CO HAI LOAI BUT :LOAI 1 GIA 2000 DONG MOT CHIEC ,LOAI 2 GIA 1500 DONG MOT CHIEC .BAN MAI MUA DUOC NHIEU NHAT BAO NHIEU BUT NEU :
A . MAI CHI MUA BUT LOAI 1 ?
B.MAI CHI MUA BUT LOAI 2 ?
C .MAI CHI MUA CA HAI LOAI BUT VOI SO LUONG NHU NHAU ?
do : dien vao cho trong bai toan sau sao cho de giai bai toan do ta phai tinh gia tri cua bieu thuc neu trong bai 78 trang 33
an mua 2 cay but bi gia....dong 1 chiec, mua3 caiquyen vo gia....dong 1 quyen, mua mot quyen sach va 1 goi phon bi. biet so tien mua 3 quyen sach = so tien mua 2 quyen vo ,tong so tien phai tra la 1200 dong. tinh gia tien 1 goi phon bi
An mua 2 but bi gia ...dong 1 chiec, mua 3 quyen vo gia ... dong 1 quyen , mua 1 quyen sach va 1 goi phong bi . biet so tien mua 3 quyen sach bang so tien mua 2 quyen vo , tong so tien phai tra la 12000 dong . tinh gia tri 1 goi phong bi
ban MAI dung 25000 dong mua but co hai loai but loai 1 gia 2000dong 1 chiec loai 2 gia 1500 dong 1 chiec ban MAI mua duoc nhieu nhat bao nhieu but neu
a] MAI chi mua but loai 1 ?
b] MAI chi mua but loai 2 ?
c] MAI ca hai loai but voi so luong nhu nhau ?
ban An co 30 000 dong dung de mua vo co 2 loai vo: loai 1 gia 3000 dong loai 2 gia 1500 dong ban An mua duoc nhieu nhat bao nhieu quyen vo neu
a) ban An chi mua vo loai1
b) ban An mua 5 quyen vo loai1 , so tien con lai mua vo loai 1
2)
a) cho tap hop A cac so tu nhien lon hon 7 va nho hon 13 . hay viet tap hop A bang hai cach
b) cho B ={2;4;6;8;.....;52;54} tap hop B co bao nhieu phan tu tinh tong cac phan tu thuoc tap hop B
