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Bai1.a,(3x-10):1050 b,4(3x-4)-218 c,|x|-53 d,|2x-5|7 f,2(| x-1|-3)-17 g,x+520-(12-7)h,10-2x25-3x i,|x+1|+31 k,|x+1|+|3-x|0 m,|x+1|+|3-y|0 n,|x+1|+|3-y|_0 o,(x+1)(y-2)0 p,(x+1)(y-2)2(x,y thuộc N)Bai2.cho doan thang AC7cm.Diem B nam giua A vaC sao cho BC3cma,tinh do dai doan thang ABb,Tren tia doi cua tia BA lay diem D sao cho BD6cm.So sanh BC va CDc,Diem C co la trung diem cua BD khong?Bai 3. Tren...
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Bai1.
a,(3x-10):10=50 b,4(3x-4)-2=18 c,|x|-5=3 d,|2x-5|=7 f,2(| x-1|-3)-1=7 g,x+5=20-(12-7)
h,10-2x=25-3x i,|x+1|+3=1 k,|x+1|+|3-x|=0 m,|x+1|+|3-y|=0 n,|x+1|+|3-y|_<0
o,(x+1)(y-2)=0 p,(x+1)(y-2)=2(x,y thuộc N)
Bai2.cho doan thang AC=7cm.Diem B nam giua A vaC sao cho BC=3cm
a,tinh do dai doan thang AB
b,Tren tia doi cua tia BA lay diem D sao cho BD=6cm.So sanh BC va CD
c,Diem C co la trung diem cua BD khong?
Bai 3. Tren duong thang xy,lan luot lay cac diem A,B,C theo thu tu do sao cho AB=6cm;AC=8cm
a,Tinh do dai cua doan thang BC
b,Goi M la trung diem cua doan thang AB.Hay so sanh MC va AB
Bai 4. Cho hai tia doi nhau Hx va Hy. Tren cac tia Hx,Hy lan luot lay diem B,C sao cho HB=6cm,HC=4cm.Gọi M,N la trung diem thu tu cua HB,HC.
a,tinh do dai dai doan MN.
b,Lay diem A khong thang hang voi B,C roi noi A voi H,B,C,M,N.Hay ve hinh va ghi lai ten cac doan thang co trong hinh ve.
tren tia Ox, lay hai diem M va N. sao cho OM =4cm, ON =2cm.
a) diem N co nam giua O va Mkhong? vi sao?
b) diem N co la trung diem cua OM khong ? vi sao?
c) tren tia doi cua tia Ox lay diem E sao OE = 2ON. hoi diem O co a trung diem cua doan thang EM khong ? vi sao?
d) goi A la trung diem cua doan thang NM. goi B la trung diem cua doan thang ON. tinh do dai doan thang AB?
Tren doan thang AC dai 12cm lay diem B sao cho AB = 5cm
a) Tinh do dai cua doan thang BC
b) Goi MN lan luot la trung diem cua cac doan thang AB, AC.Tinh do dai doan thang MN
c) Lay D thuoc tia doi cua tia CA sao cho CD = 7cm.CTR diem C la trung diem cua doan thang BC
1, cho doan thang dai 3cm. tren tia AB lay diem I sao cho IA=2cm.
a, tinh IB
b, lay diem C thuoc tia doi cua tia BI sao cho BC = 3cm. tinh IC
2, cho doan thang MN=8cm. goi R la trung diem cua MN
a, Tinh MR, RN
b, lay 2 diem PQ tren doan MN sao cho MB bang NQ =3cm. tinh PR, QR
c, diem R co phai la trung diem cua PQ khong. vi sao
cac ban ve hinh ra gium minh nhe, minh can gap, cam on cac ban nhieu
a] ve hinh theo dien dat sau:ve hai duong thang a,b cat nhau tai O.tren a lay cac diem A,A,C theo thu tu tren .tren b lay m,N,P theo thu tu
tren .Goi K la giao cua doan thang AN va BM,goi H la giao cua doan thang AP va CM ,goi I la giao cua doan thang CN va PB
b] hay nhan xet 4 diem O,K,H,I
tren tia ox ve 2 doan thang om va on sao cho om=3cm ,on=6cm
a) diem m co nam giua hai diem o va n khong? tai sao?
b) tinh do dai doan mn
c) diem m co la trung diem cua on khong ? tai sao?
d) lay e la trung diem cua doan thang mn.tinh do dai doan thang oe
Cho 2 tia doi nhau Ax, Ay ( chung goc A ). Tren tia Ax lay cac diem M,N sao cho AM = 5cm; AN = 1cm
a, Tinh do dai doan thang MN
b, Tren tia Ay xac dinh diem P sao cho AP = 3 cm. Tinh do dai PN
c, Tren hinh ve diem N co la trung diem cua doan thang nao khong? Vi sao?
Cho diem C nam giua hai diem A va B, biet AB = 6cm. Goi M va N lan luot la trung diem cua cac doan thang AC va BC.
a) Tinh do dai doan thang MN.
b) Hay neu cach chon diem C de cho do dai doan thang MN gap 3 lan do dai doan MC.
Tren tia Ox lay 2 diem A va B sao cho OA =4cm , OB =8cm
a . Tinh AB
b. Diem A co la trung trung diem cua doan thang OB khong ? Vi sao ?
c. Tren tia Bx lay diem C tuy y . Goi M;N theo thu tu la trung diem AB ;BC . Tinh AC . Biet MN = 5cm
Cac ban giai dum minh cau c chung duoc .Thank you