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Dãy trên có 66 số hạng
Quy luật: a2,(a+1)2,(a+2)2,...(a+n)2
a) 44.25=25.4.11=100.11=110044.25=25.4.11=100.11=1100
b) 125.56=125.8.7=1000.7=7000125.56=125.8.7=1000.7=7000
c) 19.8=19.4.2=76.2=152
What is this and how do you spell it?
Gọi số cần tìm là xx
Có: (32;41)=1(32;41)=1
⇒BCNN(32;41)=32.41=1312⇒BCNN(32;41)=32.41=1312
⇒BC(32;41)={0;1312;2624;3936;...}⇒BC(32;41)={0;1312;2624;3936;...}
mà9<x<100mà9<x<100
⇒x∈∅
Trong một phép chia có dư, ta lấy số bị chia trừ đi tích của số chia và số thươngthì được 6 đơn vị. Tìm số dư trong phép chia đó.
a,a, A=23+26+212+224+248+296+2192A=23+26+212+224+248+296+2192 A×2=(23+26+2 12+224+248+296+2192)×2A×2=(23+26+2 12+224+248+296+2192)×2
A×2=43+23+26+212+224+248+296A×2=43+23+26+212+224+248+296
A×2−A=(43+23+26+212+224+248+296)−(23+26+212+224+248+296+2192)A×2−A=(43+23+26+212+224+248+296)−(23+26+212+224+248+296+2192)
A=43+23+26+212+224+248+296−23−26−212−224−248−296−2192A=43+23+26+212+224+248+296−23−26−212−224−248−296−2192
A=43−2192A=43−2192
A=12796A=12796
Make the questions
E.g:They often have breakfast at 7 o'clock-Do they often breakfast at 7 o'clock?
1.Does Mary walk to work every day?
2.Does my sister love Maths?
3.Does my brother study English every night...............................................................?
4.Does The Earth go around the Sun............................................................................?
5.Does The plane take off at 4pm this weekend?..........................................................?
6.Does My mother sweep the floor every afternoon......................................................?
7.Does Peter have lunch at school................................................................................?
8.do Mary and Peter usually go to the cinema together............................................?
9.Do They often watch TV..........................................................................................?
10.Does Her mother wake up at 6.30 in the morning....................................................?
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have
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