tong cua 3 so A B C gap 4 lan so B TIM MOI SO BIET A HON B 56B DON VI VA IT HON C 23 DON VI
Tim 3 so a,b,c biet tong cua 3 so bang 66,76 don vi a be hon c 12,74 don vi , a be hon b 22.4 don vi
tim mot so co hai chu so biet rang so do gap 7 lan tong cua no va chu so hang chuc hon chu so hang don vi la 4
tong cua hai so la 30,3 biet so lon hon do be 8,5 don vi hoi cung bot o moi so bap nhieu don vi de so lon gap 3 lan so be
1.tim 2 so a va b biet khi chia a cho b thi duoc thuong la 5,du 2 va tong cua chung la 40
2.mot hinh chu nhat co chieu dai gap 5 lan chieu rong,chieu rong ngan hon chieu dai 24m.tim chu vi
3.tich cua 2 so la 6210.neu giam so nhan di 7 don vi thi tich moi la 5265.tim 2 so ban dau
4.tong cua so thu nhat va so thu 2 la 56,tong cua so thu 2 va so thu 3 la 64 va tong cua so thu 3 va so thu nhat la 78.tim 3 so do
5.tong cua 2 so tu nhien gap 3 lan hieu cua chung.tim thuong cua 2 so do
nho cac ban giai chi tiet gium to nhe
cho 3 so a,b va c co tong bang 5850.so a be hon so b la 15 don vi va so b be hon so c 30 don vi . tim so c
viet tap hop cac so tu nhien co hai chu so,trong do:
a,chu so hang don vi lon hon chu so hang chuc 4 don vi
b,chu so hang don vi gap 3 lan chu so hang chuc
c,chu so hang don vi nho hon chu so hang chuc va tong hai chu so =17
a) 51 ; 62 ; 73 ; 84 ; 95
b) 13 ; 36 ; 69 ;69
c) 98
tong cua 2 so gap 8 lan hieu , biet 5 phan 8 cua tong thi hon hieu 16 don vi . tim 2 so
Cho 3 so tu nhien A,B,C co tong la 6850 , trong do so A be hon so B la 25 don vi , so A be hon so C la 45 don vi .Tim moi so
tim mot so co 3 chu so biet rang neu doi chu so hang tram va chu so hang don vi cho nhau so moi lon hon so cu 792 don vi chu so hang don vi gap 3 lan chu so hang chuc
Gọi số đó là abc
Theo bài ra ta có cba-abc=792
(100c+10b+a)-(100a+10b+c)=792
100c+10b+a-100a-10b-c=792
99c-99a=792
99(c-a)=792
c-a=8
mà c:a=3
3a-a=8
2a=8
a=4; c=12(vô lý)
Không có abc