=a+b+c/b+c+a+c+a+b
=a+b+c/2a+2b+2c
=a+b+c/2(a+b+c)
=1/2.
tick nha !!
=a+b+c/b+c+a+c+a+b
=a+b+c/2a+2b+2c
=a+b+c/2(a+b+c)
=1/2.
tick nha !!
tim cac so nguyen duong a,b,c biet a^3-b^3-c^3=3abc va a^2=2(b+c)
nho giai thich ro ho minh nhe
bai 1: a) tim p/s co mau so bang 10, lon hon -7/13, nho hon -4/13
b) tim 10 so a/b biet -1/2<a/b<1/2
c) tim cac p/s -3/5<a/20<-1/4
ai tra loi nhanh va dung mk tick cho
giup toi voi
a/b+c=b/c+a=c/a+b biet a+b+c khac 0. tim gia tri cua moi ti le thuc do
a. Tim so tu nhien nho nhat sao cho khi chia no cho 17 thi du 5,con khi chia cho 19 thi du 11
b, Tim a thuoc N biet 355 chia a du 13, 836 chia a du 8
Giup minh voi nhe!!
Hihihi.Hi moi nguoi.Minh se dat mot cau hoi ve dai so lop 7,mong moi nguoi chi giai><,boi vi toan minh hoc chua gioi lam nen co cac bai toan con thac mac,len day de mong nhan duoc su giup do,de toan nhu sau:(1)Da thuc P(x)=x2016 +2013x + 2012 co ngiem duong khong?Vi sao?. 2 Bai nua nhe(*^-^*):
(2)Cho hai da thuc: M(x)=2,52 -0,5x-x3-1
1/2N(x)=-x3+2,5x2-6+2x
a)Tim A(x)=M(x)-N(x).Sau do tim mot ngiem cua da thuc A(x)
b)Tim da thucB(x) biet B(x)=M(x)+N(x).Cho biet bac cua da thuc B(x).
(3)Cho da thuc:f(x)=ab2 + bx + c.Chung to neu f(x) co ngiem x=-1 thi b=a+c.
MOT BAI NUA THOI MA.NHA NHA NHA MOI NGUOI^_^:
(4)Cho hai da thuc:A=(-1/2axy3)2 va B=(-3a2 x2)3 (a la hang so khac 0).
a)Tinh M=A.B roi cho biet he so va phan bien cua M
b)Tim bac cua M.
AI CO CAU TRA LOI NHAN TIN TRA LOI CHO MINH BIET NHAAAAA.CAM ON!!!!!.
chung minh rang : a/b= c/d suy ra a/b=a+c/b+d
giup minh nhe !!! cam on nhieu minh se mk voi???
cho cac so a, b, c ko am thoa man: a+3c=2016,a+2b=2017. tim gia tri lon nhat cua bieu thuc:P=a+b+c
ai tra loi xong ma dung thi to tick cho. con neu ko tra loi duoc ma kb voi to hoac tick cho dap an dung cua to thi to cung tick
Cho a=b+c va c=bd/b-d. Chung minh rang : a/b=c/d
giup minh nhanh len nhe
Cho phân số a/b = c/d . Chứng minh rằng a) a/a-b = c/c-d b) 3a +2c/3b+2d = -5a + 3c/-5b+3d c) a^2/b^2= 2c^2-ac/2d^2-bd
Minh dan gap giup minh voi nhe thank nhiu