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a) Vì 73* \(⋮\) 5
nên * \(\in\) {0; 5}
b) Vì 73* \(⋮\) 2
nên * \(\in\) {0; 2; 4; 6; 8}
c) Vì 73* \(⋮\) 3; 73* \(⋮\) 9
nên 73* \(⋮\) 9
Để 73* \(⋮\) 9 thì
7 + 3 + * \(⋮\) 9 = 10 + * \(⋮\) 9
=> * = 8
a) 35
b) 18
c) 15
d) 5
tik đúng cho mk nha
Giải
Mỗi phút Tâm cắt được số bông hoa là:
36 : 9 = 4(bông)
Mỗi phút Thảo cắt được số bông hoa là:
35 : 7 = 5(bông)
Mỗi phút Uyên cắt được số bông hoa là:
30 : 10 = 3(bông)
Vậy Thảo cắt nhanh nhất, Uyên cắt chậm nhất
a) \(\dfrac{5}{4}=\dfrac{4\times20}{5\times20}=\dfrac{80}{100}\)
\(\dfrac{5}{4}=\dfrac{4\times200}{5\times200}=\dfrac{800}{1000}\)
X x 35 - 1,25 = 145,75
X x 35 = 145,75 + 1,25
X x 35 = 147
X = 147 : 35
X = 4,2
a) (17x - 132):8 = 15
17x - 132 = 15.8
17x - 132 = 120
17x - 169 = 120
17x = 120 + 169
17x = 289
x = 289 : 17
x = 17
1. When do you get up?
2. What do you do?
3. Where does Jonh come from?
4. How long does it take from London to Paris?
5. How often does she go to the cinema?
a) 2.52 + 3:710 - 54:33
=2.25 + 3:1 - 54:27
=50 + 3 - 2
=53 - 2
=51
b)12:{400:[5.102-(53+25.7)]}
=12:{400:[5.100-(125+25.7)]}
=12:{400:[500-(125+175)]}
=12:{400:[500-300]}
=12:{400:200}
=12:2
=6
876 - 42 - 76 + 242
=(876 - 76) + (242 - 42)
=800 + 200
=1000