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1.
Giải
Gọi số bút chì màu là a (a thuộc N *)
15 <hoặc = a<hoặc bằng 20
Theo đề bài, ta có :
20 chia hết cho a
15 chia hết cho a
=> a thuộc ước chung (15,20)
Ta có:
20=22 . 5
15=3.5
=> ước chung của(15,20) = ước chung lớn nhất (15,20)
=5( Vì chỉ có một thừa số nguyên tố chung là 5)
=> Mỗi hộp bút chì màu có 5 cái
Vậy mỗi hộp bút chì màu có 5 cái
An mua số hộp bút là:
20 : 5 = 4 (hộp)
Bình mua số hôp bút là:
15 :5 =3 (hộp)
Vậy mỗi hộp bút có 5 cái bút và An mua 4 hộp bút, Bình mua 3 hộp bút.
2.Mk ko bít
3,
Giải
Số vốn của nhà kinh doanh tăng sou 3 năm kinh doanh là:
20-43+65=42 (triệu)
Vậy @#!$%^
4,
Hình thì bạn tự vẽ nha
B,C thuộc tia Ax
mà AB = 3cm <AC =9cm
=> B là trung điểm của AC
=> AB + BC = AC
=> 3+BC =9
=> BC = 9-3
=> BC = 6 cm
b, Giải tương tự như phần a
c,AM =BK
Mk ko bít
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Hình vẽ:
a/ Ta có: AM = 4 cm; AB = 8 cm
Vì AM < AB (4 <8) nên M nằm giữa A và B
b/ Ta có: AB = AM + MB
hay 8 = 4 + MB
=> MB = 4 cm
Ta có: AM = MB ( 4cm = 4cm)
c/ Ta có: AM = MB = 4cm = \(\frac{1}{2}\)AB
nên M là trung điểm AB
1/ đúng
2/ đúng
3/sai thiếu điều kiện M,A,B thẳng hàng
a) Trên tia Ox , ta có : OA = 3cm , OB = 7cm
\(\Rightarrow\)OA < OB
\(\Rightarrow\)Điểm A nằm giua O và B
Ta có : OA + AB = OB
Thay số : 3 +AB = 7
=> AB = 7 - 3 = 4cm
