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=3cma,tinh do dai doan thang ABb,Tren tia doi cua tia BA lay diem D sao cho BD=6cm.So sanh BC va CDc,Diem C co la trung diem cua BD...
Đọc tiếp
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.
