So A duoc chia thanh 3 so ti le theo 3/5 : 2/3 : 3/4. Biet rang tong cac binh phuong cua 3 so do bang 4921. Tim so A
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cho A duoc chia thanh 3 so theo ti le 2/5;3/4;1/6.Biet rang tong cac binh phuong cua 3 so do la 24309.Tim so A
Ta có:a:b:c=2/5:3/4:1/6(1)
a2+b2+c2=24309(2).Vậy a/2/5=b/3/4=c/1/6=k vậy a=2/5k;b=3/4k;c=1/6k
Vậy ta có:k2(4/25+9/16+1/36)=24309
k2=32400 =>k=180 hay-180
Nếu k=180 thì a=72;b=135;c=30=>A=72+135+30=237
Nếu k=-180 thì A=-237
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so a duoc chia thanh 3 so ti le theo 2/5;3/4;1/6. Biet rang tong binh phuong cua ba so do bang 24309. Tim so a
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Mot so A dc chia thanh 3 phan ti le nghich vs 5 , 2 , 4. Biet tong cac lap phuong cua 3 phan do la 9512. Tim A.
tim so co 2 chu so biet 3 lan so do bang binh phuong 1 tong cac chu so cua so do va bang 4 lan tong cac chu so do
1. Tim trung binh cong cua tat ca cac so tu nhien co 4 chu so khac nhau duoc viet boi bon chu so 0;3;5;7.Trung binh cong cua tat ca cac so do la?2 .Tong cua 3 so bang 5,2. So thu nhat bang 2/3 so thu ba va so thu hai bang 50% so thu ba. Tim so thu hai?3. Tim mot phan so co mau so bang 25 , biet rang neu cong tu so voi 34 va nhan mau so voi 3 thi duoc phan so moi bang phan so da cho. Tim phan so do?4. Tim mot phan so biet rang neu cong them 4 vao tu so va giu nguyen mau so thi ta duoc phan so moi...
Đọc tiếp
1. Tim trung binh cong cua tat ca cac so tu nhien co 4 chu so khac nhau duoc viet boi bon chu so 0;3;5;7.Trung binh cong cua tat ca cac so do la?
2 .Tong cua 3 so bang 5,2. So thu nhat bang 2/3 so thu ba va so thu hai bang 50% so thu ba. Tim so thu hai?
3. Tim mot phan so co mau so bang 25 , biet rang neu cong tu so voi 34 va nhan mau so voi 3 thi duoc phan so moi bang phan so da cho. Tim phan so do?
4. Tim mot phan so biet rang neu cong them 4 vao tu so va giu nguyen mau so thi ta duoc phan so moi bang 1, con neu giu nguyen tu so va cong them 3 thi ta duoc phan so moi bang 1/2 .Tim phan so do?
5. Hay cho biet co tat ca bao nhieu so co 3 chu so ma tong co chu so cua moi so bang 4 . co tat ca bao nhieu so thoa man?
chia so 135 thanh 3 phan ti le nghich voi 7;9;21.biet tong cac lap phuong cua chung la 562688.tim 3 phan do
1.viet so tu nhien nho nhat co tong cac chu so bang 38?2.mot phep chia hai so tu nhien co thuong la 6 va so du la 33.tim so bi chia,so chia,biet rang tong cua so bi chia,so chia,thuong va so du bang 695.3.trung binh cong cua 3 so le lien tiep bang 299.tim so lon nhat trong 3 so do?4.cho phan so a/b.rut gon so phan so a/b ta duoc phan so 5/7.neu them 71 don vi vao tu so va giu nguyen mau so,ta duoc phan so co gia tri bang 18/11.tim phan so a/b?5.tim y biet:a(2/11*13+2/13*5+2/15*17+2/17*19+2/19*21...
Đọc tiếp
1.viet so tu nhien nho nhat co tong cac chu so bang 38?
2.mot phep chia hai so tu nhien co thuong la 6 va so du la 33.tim so bi chia,so chia,biet rang tong cua so bi chia,so chia,thuong va so du bang 695.
3.trung binh cong cua 3 so le lien tiep bang 299.tim so lon nhat trong 3 so do?
4.cho phan so a/b.rut gon so phan so a/b ta duoc phan so 5/7.neu them 71 don vi vao tu so va giu nguyen mau so,ta duoc phan so co gia tri bang 18/11.tim phan so a/b?
5.tim y biet:a=(2/11*13+2/13*5+2/15*17+2/17*19+2/19*21)*462-y=19
cac ban giai chi tiet gium minh nhe,ban nao giai duoc minh cho ***** lun