tren duong thang xy , lay cac diem A,B,C , theo thu tu do, sao cho AB=6cm , AC= 8cm
a/ Tinh do dai doan thang BC
b.goi M la trung diem cua doan thang AB .Hay so sanh MBva AC
tren duong thang xy lay 3 diem A,B,C(C nam ngoai doan thang AB ) sao cho AB=8cm , BC=4cm. goi M,N,P lan luot la trung diem cua doan thang AB,AC,CB
a) tinh do dai doan thang MN
b) C/M rang MN va AP co cung trung diem
tren doan thang AC co do dai 12 cm ,lay diem B sao cho AB=5 cm .a, tinh do dai cua doan thang BC.b,goi M,N lan luot la trung diem cua doan thang AB ,BC . tinh do dai doan thang MN.c, lay diem D thuoc tia doi cua tia CA sao cho CD =7 cm . chung to rang diem C la trung diem cua doan thang BD
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
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 duong thang a lay 2 diem A va B sao cho AB=2cm lay diem C sao cho A la trung diem cua doan thang BC lay diem D sao cho B la trung diem cua doan thang AD a)tinh do dai doan thang CD b) goi trung diem cua AB la M tim trung diem cua doan thang CD
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.
cho doan thang AB=7 cm diem C nam giua A va B sao cho AC=3 cm cac diem D va E theo thu tu la cac trung diem cua AC va BC goi I la trung diem cua DE tinh do dai cac doan DE=? VA CI=?
tren tia Ax lay 2 diem B và C sao cho AB=6cm , AC=10cm . tinh do dai doan thang BC . Goi M la trung diem doan thang AB va N la trung diem cua doan thang AC . Tinh do dai doan MN