1) 3 người cùng làm 1 công việc . Thi het 2 gio 40 phut , neu 1 minh nguoi thu nhat lam xong cong viec thi het 8 gio, nguoi thu 2 mot minh lam thi het 12 gio . Hoi neu chi co 1 minh nguoi thu 3 thi lam xong cong viec het may gio
2) cho 2 so thap phan 17,2 va 56,2 . Tim so A biet rang neu lay cac so da cho tru di A ta duoc 2 so moi ma so lon gap 4 lan so be
3) hoi co bao nhieu chu so 8 tu 1 den 1000
1) 2 nguoi cung lam chung mot cong viec , sau 12 gio thi hoan thanh . Neu nguoi thu nhat lam 1 minh 2/3 cong viec mat 10 gio . Hoi nguoi thu hai lam 1/3 cong viec thi mat bao lau ?
2) So N la so co 2 chu so chia het cho 3 . Neu viet xen so 0 vao giua 2 chu so do roi cong no voi 2 lan chu so hang chuc cua so N ta duoc so moi gap 9 lan so N . Tim so N ?
Cac ban giai duoc bai nao thi giai nhe !
Hai nguoi tho lam chug mot cong viec het 16 gio. Neu nguoi tho thu nhat lam 3 gio va nguoi tho thu 2 lam trong 6 gio thi ho lam duoc 1/4 cong viec. Hoi nguoi thu nhat lam xong cong viec het bao nhieu thoi gian ?
Ba nguoi tho lam chung nhau mot cong viec thi sau 3 gio se xong. Neu mot minh nguoi thu nhat lam phai mat 8 gio moi xong. Mot minh nguoi thu 2 lam phai mat 12 gio moi xong .hoi mot minh nguoi thu ba lam thi het may gio moi xong
1) Ban Xuan mua sach toan va sach van het 70 500 dong . Ban Ha mua sach toan va sach van het 64 500 dong . Biet moi quyen sach toan gia 7 500 dong , sach van gia 6 000 dong va so sach toan ban cua ban nay so sach van cua ban kia . Hoi ban Xuan mua bao nhieu sach toan , bao nhieu sach van ?
2) Hai nguoi cung lam chung 1 cong viec sau 12 gio thi hoan thanh . Neu nguoi thu nhat lam mot minh 2/3 cong viec mat 10 gio . Hoi nguoi thu hai lam 1/3 thi het bao lau moi xong ?
Cac ban giai duoc bai nao thi giai nhe !
ba nguoi cung lam xong 1 cong viec se hoan thanh cong viec do trong 2 gio 40 phut. neu lam rien 1 minh thi nguoi thu 1 phai mat 8 gio moi xong cong viec, nguoi thu 2 phai mat 12 gio moi cong cong viec. hoi nguoi thu 3 lam mot minh thi mat may gio moi xong cong viec
Viết dap an duoi dang so thap phan :
Hai cong nhan cung lam chung mot cong viec . Nếu nguoi thu nhat lam rieng thi lam xong trong 8 gio . neu mot minh nguoi thu hai lam rieng thi 12 gio se lam xong . hoi ca hai nguoi lam chung thi sau may gio xong cong viec
neu hai nguoi lam xong 1 cong viec het 6 gio. Neu nguoi thu 1 lam mot minh thi phai het 10 gio. hoi neu nguoi thu hai lam mot minh thi phai mat bao lau
3 nguoi cung lam 1 cong viec. neu chi co nguoi thu nhat va nguoi thu hai thi 15 gio se xong. neu chi co nguoi thu hai va nguoi thu ba thi 20 gio se xong . neu chi co nguoi thu 1 va nguoi thu 3 thi lam xong trong 12 gi se xong
a] hoi neu ca ba nguoi thi may gio se xong
b]neu moi nguoi lam 1 minh thi can may gio se xong
Ba nguoi cung lam chung 1 cong viec het 2 gio 40 phut. Neu lam rieng mot minh thi nguoi thu 1 mat 6 gio, nguoi thu 2 mat 12 gio. Hoi nguoi thu 3 mat bao nhieu gio ?
