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

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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

tim 2 so biet rang lay so lon tru di so be  ta duoc 0,9 , gap so lon len 6 lan tru di so be ta duoc 6,4 tim 2 so

1.Cho so N la so co hai chu so chia het cho 3.Neu viet xen so 0 vao giua hai chu so do roi cong no voi hai lan chu so hang chuc cua so N ta duoc so moi gap 9 lan so N.Tim so do

2.Tong hai so thap phan la 60,1.Neu dich dau phay cua so nho sang ben phai mot hang roi dem tru di so lon thi ta duoc 219,52.Tim hai so do.

3.Tim so co hai chu so biet neu ta them so 33 vao giua hai chu so do thi duoc mot so moi gap so phai tim 89 lan.

tim hai so biet rang so lon tru so be duoc 0,9. Neu gap so lon len 6 lan roi tru so be ta duoc 6,4.

tim 2 so biet rang lay so lon tru di so be ta duoc 0,9 ngoai ra so lon gap len 6 lan so lon roi tru di so be thi duoc 6,4

tim 2 so , biet rang so lon gap so be 12 lan va neu giam so lon di 4 lan va tang so be len 2 lan thi duoc 2 so moi co tong la 60 . tim 2 so

Tim hai so tu nhien,biet rang lay so lon tru so be thi duoc ket qua la 54 va lay so lon chia cho so be duoc thuong la 4 du 9.cac ban giai cho minh voi nhe.cam on.

tim 2 so biet rang lay so lon tru di so be duoc 0,9 . gap so lon lel 6 lan roi tru đi so be thi duoc 6,4