Cho a,b,c la cac so nguyen to thoa man ab+ba=c.Khi doS=a5+b4+c3 co gi atri la bao nhieu? giup mk nhe bn nao nhanh tay mk tick cho
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cac ban giai giup minh bai tap nay khan cap nhe:
cho cac so a,b,c la ba so nguyen khac 0, thoa man: ab/(a+b)=bc/(b+c)=ac/(a+c) ( gia thiet cac ti le thuc deu co nghia). tinh M= (ab + bc + ca)/(a^2+b^2+c^2)
xin cam on rat nhieu
Cho a,b,c la cac so nguyen duong.CMR: P=a/a+b + b/b+c + c/a+c khong la 1 so nguyen (dau "/" la dau gach phan so nhe) GIUP MIK VS MIK DANG CAN GAP BN NAO GIAI DC MIK TICK NHA! help me
Cho bieu thuc B= 7/ n -7
a) So nguyen n phai co dieu kien gi de B la phan so.
b) Tim phan so B biet n = -7
c) Tim cac so nguyen n de B la so nguyen.
bn nao co loi giai chi tiet bai nay mk se tick,vi mk dung dien thoai ko viet dau dc nen cac ban thong cam nha.
Giup mk nua nhe
Tim tong cac so nguyen x thoa man : - 20_< X < 15
Cai dau _< la nho hon hoac bang day
Vì x thuộc Z và - 20 \(\le\)x < 15
=> x thuộc { - 20 ; - 19 ; - 18 ; - 17 ; - 16 ; - 15 ; - 14 ; - 13 ; - 12 ; - 11 ; - 10 ; - 9 ; - 8 ; - 7 ; - 6 ; - 5 ; - 4 ; - 3 ; - 2 ; - 1 ; 0 ; 1 ; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8 ; 9 ; 10 ; 11 ; 12 ; 13 ; 14 }
Vậy tổng các số nguyên x là :
( - 20 ) + ( - 19 ) + ( - 18 ) + ( - 17 ) + ( - 16 ) + ( - 15 ) + ..... + 10 + 11 + 12 + 13 + 14
= ( - 20 ) + ( - 19 ) + ( - 18 ) + ( - 17 ) + ( - 16 ) + ( - 15 ) + [ ( - 14 ) + 14 ] + ..... + [ ( - 1 ) + 1 ] + 0
= ( - 20 ) + ( - 19 ) + ( - 17 ) + ( - 16 ) + ( - 15 ) + 0 + ..... + 0 + 0
= ( - 39 ) + ( - 18 ) + ( - 17 ) + ( - 16 ) + ( - 15 ) + 0
= ( - 57 ) + ( - 17 ) + ( - 16 ) + ( - 15 ) + 0
= ( - 74 ) + ( - 16 ) + ( - 15 ) + 0
= ( - 90 ) + ( - 15 ) + 0
= ( - 105 ) + 0
= - 105
= ( - 72 ) + ( - 15 ) + 0
= ( - 87 ) + 0
= - 87
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Ha nghi ra mot so neu lay so do chia cho 2duoc bao nhieu roi lai chia cho 3thi duoc ket qua la so lon hon so nho nhat co 3 chu so la 5 .Hoi Ha nghi den so nao
giai ho mk nhanh nhe cac pn cam on nhieu nha
bai 1 : cho 21 so nguyen trong do tong 5 so bat ki la 1 so duong. cmr tong 21 so nguyen do la 1 so duong.
giup mk nha mina.....mk tick cho ban nao giai dung nhat ( ghi ro cach trinh bay nhe)
tim tat ca cac so nguyen to a,b,c co the bang nhau thoa man abc<ab+bc+ca chung minh rang neu b la so nguyen to >3 thi (b+1)(b-1) chia het cho 24
cho a b c la cac so nguyen khac 0 thoa man ab - ac + bc = c^2 -1. khi do a/b bang bn
1.
129 chia cho 1 so duoc du 10. 61 chia cho so do cung duoc du 10. Tim so chia?????????????????
2.
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GIUP MK VOI CAC BAN MK TICK CO BN NHANH NHAT VA CO BAI GIAI CU THE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!