a) Tính tổng của ab + ba ( biết a + b = 6 )
b) Tinh hieu cua ab - ba ( biet a - b = 5 )
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a )Tính tổng ab + ba ( biết a + b =9 )
b) Tính hiệu của ab - ba ( biết a - b = 5 )
trang oi bang ab bang 62 ba bang 26 bang 98
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a) Cho a=4,b=5
Ta có:\(4.5+5.4=20+20=40\)
b)Cho a=9, b=4
Ta có: \(9.4-4.9=36-36=0\)
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Tren duong thang a lay ba diem A,B,C.Goi E la Fla trung diem cua AB va BC.
a)Gia su AB=5,BC=6.Tinh EF
b)Gia su AC=11.Tinh EF
cho doan thang AB=8cm C thuoc doan thang AB sao cho AC=3cm a) tren tia BA lay D sao cho BD=11cm chung to A la trung diem cua CD b)tren tia BA lay n diuem phan biet khac A,B,C,D tinh n biet tren tia co tat ca 1770 doan thang
Tren duong thang a lay ba diem A,B,C.Goi E va F la trung diem cua AB va BC.
a)Gia su AB=5,BC=6.Tinh EF
b)Gia su AC=11.Tinh EF.
cho ba diem A,B,C thu tu thang hang.Goi E va F LA trung diem cua AB va BC.
a)Gia su AB=5.BC=6.tinh EF.
b)Gia su AC=11.Tinh EF.
khong tinh gia tri cua a va b hay so sanh a va b va tinh hieu cua chung biet rang.
A=2004.2005
B=2000.2009
A = 2004.2005
= (2000 + 4).2005
= 2000.2005 + 4.2005
B = 2000.2009
= 2000.(2005 + 4)
= 2000.2005 + 2000.4
=> A > B
@Nguyễn Hoàng Nina
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Cau 5: Trong cac khang dinh sau, khang dinh nao dung, khang dinh nao sai?1.Ba diem phan biet la ba diem thang hang.2.Voi ba diem phan biet luon co hai diem nam ve cung phia doi voi diem con lai.3.Voi ba diem thang hang phan biet luon co hai diem nam khac phia voi diem con lai.4.Voi ba diem A,B,C thang hang thi diem B luon nam giua hai diem A,C.5.Co mot va chi mot duong thang di qua hai diem (phan biet) cho truoc.6.Hai duong thang phan biet thi song song voi nhau.7.Hai tia chung goc thi cung nam...
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Cau 5: Trong cac khang dinh sau, khang dinh nao dung, khang dinh nao sai?
1.Ba diem phan biet la ba diem thang hang.
2.Voi ba diem phan biet luon co hai diem nam ve cung phia doi voi diem con lai.
3.Voi ba diem thang hang phan biet luon co hai diem nam khac phia voi diem con lai.
4.Voi ba diem A,B,C thang hang thi diem B luon nam giua hai diem A,C.
5.Co mot va chi mot duong thang di qua hai diem (phan biet) cho truoc.
6.Hai duong thang phan biet thi song song voi nhau.
7.Hai tia chung goc thi cung nam tren mot duong thang.
8.Hai tia chung goc thi doi nhau
9.Neu diem M nam giua diem A,B thi no la trung diem cua doan thang AB.
10.Neu MA=MB thi M la trung diem cua doan thang AB.
11.Neu MA+MB= AB va MA=MB thi M la trung diem cua doan thang AB.
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Xac dinh vi tri cua ba diem A,B,C doi voi nhau,neu biet:
a,AB=13cm,AC=5cm, BC=8cm
b,AB=6cm,BC=8cm,AC=10cm
a) ta có AC + CB = 8+5 = 13 cm = AB. Vậy A, B , C thẳng hàng ; C nằm giữa A và B
b) không có tổng của 2 đoạn nào bằng đoạn còn lại nên 3 điểm không thẳng hàng. Nghĩa là nối 3 điểm với nhau từng đôi một ta được 1 tam giác đó.
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cho ba diem a,b,c sao cho b nam giua a,c lam the nao chi do hai lan ma biet duoc do dai cua ca ba doan thang ab,bc,ac, hay neu cach lam khac nhau