Các câu hỏi tương tự
Cho biet x=-2 la nghiem cua da thuc P(x) = ax+b (a khac 0)
Tinh gia tri cua bieu thuc \(\frac{2011a+b}{3a-b}\)
Xin loi cac ban vi may minh bi hong nen khong viet dau duoc. Mong cac ban giup do minh nhe!
Minh biet day la cau hoi khong lien quan den toan, nhung cac bn giup nha1, Trong cac vat sau day, vat nao co the coi la guong cau lom?A, Pha den pinB, Mat nuoc cua cai thia inocC, Mat tren cua cai chao danh bongD, Ca ba vat deu duoc.2, Dat mot vat sang AB o phia truoc, gan sat voi guong cau lom, cho anh A B. So sanh kich thuoc cua AB voi ABA, ABABB, ABABC, ABABD, Co the A hoac B hoac C Ai nhanh, ai dung, mik tick.Ai tra loi cau hoi nay thi nho kb voi mik nha
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Minh biet day la cau hoi khong lien quan den toan, nhung cac bn giup nha
1, Trong cac vat sau day, vat nao co the coi la guong cau lom?
A, Pha den pin
B, Mat nuoc cua cai thia inoc
C, Mat tren cua cai chao danh bong
D, Ca ba vat deu duoc.
2, Dat mot vat sang AB o phia truoc, gan sat voi guong cau lom, cho anh A' B'. So sanh kich thuoc cua AB voi A'B'
A, AB>A'B'
B, AB<A'B'
C, AB=A'B'
D, Co the A hoac B hoac C
Ai nhanh, ai dung, mik tick.
Ai tra loi cau hoi nay thi nho kb voi mik nha
AN VA BINH NHIN LEN BAU TROI THAY TRANG HINH LUOI LIEM. BINH NOI DO LA HIEN TUONG NGUYET THUC, NHUNG AN QUA QUYET LA KHONG PHAI. NEU AN DUNG THI THEO CAC BAN , AN DA CAN CU VAO DAU? VI SAO?
GIUP MINH VOI, AI NHANH MA DUNG THI MINH TICK CHO 3 CAI
1.cho ti le thuc a/bc/d. chung minh ti le thuc sau :a^2-b^2/abc^2-d^2/cd2.cho tam giác abc có góc a 90 độ , abac. tren canh ac lay diem d sao cho adab. tren tia doi cua tia ab lay diem e sao cho aeac.a) chung minh rang de vuong goc voi bcb) cho biet ab5c,tinh aed3.tim x trong moi truong hop sau: |3-2x|-2x5,34.cho tam giac abc. tren nua mat phang bo ab khong chua diem c ve tia ax vuong goc voi ab , tren tia ax lay diem f sao cho afab . tren nua mat phang bo ac ko khong chua diem b , ve tia ay vu...
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1.cho ti le thuc a/b=c/d. chung minh ti le thuc sau :
a^2-b^2/ab=c^2-d^2/cd
2.cho tam giác abc có góc a = 90 độ , ab<ac. tren canh ac lay diem d sao cho ad=ab. tren tia doi cua tia ab lay diem e sao cho ae=ac.
a) chung minh rang de vuong goc voi bc
b) cho biet ab=5c,tinh aed
3.tim x trong moi truong hop sau:
|3-2x|-2x=5,3
4.cho tam giac abc. tren nua mat phang bo ab khong chua diem c ve tia ax vuong goc voi ab , tren tia ax lay diem f sao cho af=ab . tren nua mat phang bo ac ko khong chua diem b , ve tia ay vuong goc voi ac , tren do lay diem h sao cho ah=ac. goi d la trung diem cua canh bc. chung minh rang :
a) fh=2ad
b)fh vuông góc với ad
5. ba lop 7a , 7b,7c lan luot co 40,45, 50 hoc sinh. ca ba lop duoc cu 27 dai bieu tham du ngay hoi quoc te thieu nhi . so dai bieu cua moi lop ti le voi so hoc sinh cua lop . hoici moi lop duoc cu bao nhieu dai bieu ?
cau 1: Cho A frac{100^{2014}+2}{3}-frac{100^{2015}+17}{9}.tong cac cua so cua B-9ACau 2: So sanh Afrac{1}{1.2}+frac{1}{2.3}+frac{1}{3.4}+........+frac{1}{100.101}voi 1 ta doc A....1Cau 3 : Cho bon so a,b,c,d sao cho a+b+c+d khac 0 . Biet frac{b+c+d}{a}frac{c+d+a}{b}frac{d+a+b}{c}frac{a+b+c}{d}k. Vay kCau 4 : so cac so nguyen am x thoa man x^{2015}left(-2right)^{2014}Cau 5; tim x,y,z biet frac{x}{y}frac{10}{9},frac{y}{z}frac{3}{4}va x-y+z78Cau 6: tap hop cac so co ba chu so chia het cho 18 va to...
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cau 1: Cho A= \(\frac{100^{2014}+2}{3}-\frac{100^{2015}+17}{9}.\)tong cac cua so cua B=-9A
Cau 2: So sanh A=\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+........+\frac{1}{100.101}\)voi 1 ta doc A....1
Cau 3 : Cho bon so a,b,c,d sao cho a+b+c+d khac 0 . Biet \(\frac{b+c+d}{a}=\frac{c+d+a}{b}=\frac{d+a+b}{c}=\frac{a+b+c}{d}=k\). Vay k=
Cau 4 : so cac so nguyen am x thoa man \(x^{2015}=\left(-2\right)^{2014}\)
Cau 5; tim x,y,z biet \(\frac{x}{y}=\frac{10}{9},\frac{y}{z}=\frac{3}{4}\)va x-y+z=78
Cau 6: tap hop cac so co ba chu so chia het cho 18 va tong cac chu so ti le voi 1;2;3 la
Cau 7: gia tri cua tong S=1.2+2.3+.....+49.50 la S=
Cac ban hay giai cac bai toan sau day:1. Biet d dai ba canh cua 1 tam giac lan luot ti le voi 3,4,5 va co chu vi bang 96 cm . Tinh do dai 3 canh cua tam giac do. 2. Cho tam giac ABC vuong tai A . Goi M la trunng diem cua AC . Tren tia doi cua tia MB lay diem D sao cho MB MDA. Biet ABC 55° . Tinh goc ACB B . Chung minh tam giac ABM tam giac CDMC. Chung minh ABC CDA3. Me dua An 2.800.000 de dong tien dien , nuoc , internet lan luot theo ti le 7;5;2 . Ban hay giup An tinh tien dien , nuoc , inte...
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Cac ban hay giai cac bai toan sau day:
1. Biet d dai ba canh cua 1 tam giac lan luot ti le voi 3,4,5 va co chu vi bang 96 cm . Tinh do dai 3 canh cua tam giac do.
2. Cho tam giac ABC vuong tai A . Goi M la trunng diem cua AC . Tren tia doi cua tia MB lay diem D sao cho MB = MD
A. Biet ABC =55° . Tinh goc ACB
B . Chung minh tam giac ABM = tam giac CDM
C. Chung minh ABC = CDA
3. Me dua An 2.800.000 de dong tien dien , nuoc , internet lan luot theo ti le 7;5;2 . Ban hay giup An tinh tien dien , nuoc , internet ?.
4. Cho tam giac ABC vuong tai A ( AB < AC ) , goi M la trung dim cua AC . Tren tia doi cua MB lay diem D sao cho MB = MD
A. Chung minh tam giac ABM = tam gac CMD
B. Chung minh DC song song AB
C. Tinh goc CDM
D. Chung minh DC vuong goc voi AC.
1.a) frac{3}{4}x -- frac{1}{3} frac{2}{3}x -- frac{3}{5} b) frac{left(-5right)^{32}.20^{43}}{left(-8right)^{29}.125^{25}} c) left(frac{1}{2}-xright)^2 left(-2right)^22. Tim do dai 2 canh cua 1 hinh chu nhat ,biet ti so giua cac canh cua no bang 0,6 va chu vi bang 32cm .3. Cho a ^{8^{12}.25^{19}}. Tim so chu so cua a .4. Cho tam giac ABC vuong tai A . Tia phan giac cua goc B cat canh AC tai D a) Cho biet widehat{ABC} 400 . Tinh so do goc ABD b) Tren canh BC lay diem E sao cho BE BA . Chu...
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1.a) \(\frac{3}{4}\)x -- \(\frac{1}{3}\)= \(\frac{2}{3}\)x -- \(\frac{3}{5}\)
b) \(\frac{\left(-5\right)^{32}.20^{43}}{\left(-8\right)^{29}.125^{25}}\)
c) \(\left(\frac{1}{2}-x\right)^2\)= \(\left(-2\right)^2\)
2. Tim do dai 2 canh cua 1 hinh chu nhat ,biet ti so giua cac canh cua no bang 0,6 va chu vi bang 32cm .
3. Cho a = \(^{8^{12}.25^{19}}\). Tim so chu so cua a .
4. Cho tam giac ABC vuong tai A . Tia phan giac cua goc B cat canh AC tai D
a) Cho biet \(\widehat{ABC}\)= 400 . Tinh so do goc ABD
b) Tren canh BC lay diem E sao cho BE = BA . Chung minh tam giac BAD = tam giac BED va DE _|_ BC
c) Goi F la giao diem cua BA va ED . Chung minh rang tam giac ABC = tam giac EBF
d) Ve CK vuong goc voi BD tai K . Chung minh rang ba diem K , F , C thang hang .
cho4 so ko am a,b;c;d thoa man a+b+c+d=1 . Goi S la tong cac tri tuyet doi cua hieu tung cap so co duoc tu 4 so nay. S co the dat gia tri lon nhat la bao nhieu ?
xin loi cac ban vi cau hoi cua minh ko co dau nen hoi kho hieu mong cac ban giup do nha thankyou
1) Tinh dien tich manh dat hinh chu nhat biet rang ti so giua hai canh cua no frac{4}{5}va chu vi 108m. 2) Biet rang a^2b.cvoi ane b,ane cChung minh: frac{a+b}{a-b}frac{c+a}{c-a} 3) Tim so hoc sinh cua hai lop 7A va 7B, biet rang so HS lop 7A it hon lop 7B la 5 em va ti so cua hai lop la 8:9 4) Chung minh: N...
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1) Tinh dien tich manh dat hinh chu nhat biet rang ti so giua hai canh cua no = \(\frac{4}{5}\)va chu vi = 108m. 2) Biet rang \(a^2=b.c\)voi \(a\ne b,a\ne c\)Chung minh: \(\frac{a+b}{a-b}=\frac{c+a}{c-a}\) 3) Tim so hoc sinh cua hai lop 7A va 7B, biet rang so HS lop 7A it hon lop 7B la 5 em va ti so cua hai lop la 8:9 4) Chung minh: Neu \(\frac{a}{b}=\frac{c}{d}\)thi \(\frac{a+b}{b}=\frac{c+d}{d}\left(a,b,c\ne0\right)\)