1.2+1.3+1.4
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Tính nhanh:
2/1.1*1.2 + 2/1.2*1.3 + 2/1.3*1.4 + 2/1.4*1.5 +...+2/2.5*2.6
Giúp mình nhanh nhanh nha!!!
THANH YOU VERY MUCH ^_^
tính:
1.2+1.3+1.4+1.5=?
kết bạn tick luôn
mik đang rất buồn có ai trò chuyện ko
tính
1.2+1.3+1.4=?
a)1.2+1.3+1.4+1.5=2+3+4+5=14
b)1.2+1.3+1.4=2+3+4=9
tk nha+kb nx!
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1 . 2 + 1 . 3 + 1 . 4 + 1 . 5
= 1 . ( 2 + 3 + 4 + 5 )
= 1 . 14
= 14
1 . 2 + 1 . 3 + 1 .4
= 1 . ( 2 + 3 + 4)
= 1 . 9
= 9
kb nha
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1/1.2+1/1.3+1/1.4+...+1/15.6+1/16.7=
tính nhanh:1.1+1.2.+1.3+1.4+1.5+,...,+1.17+1.18+1.19
1/1.2+1/1.3+1/1.4+... +1/15.6+1/16.7
1.2+1.3+1.4+1 5=?
Ae nhanh mk k
1.2+1.3+1.4+1 5=?
=2+3+4+5
=5+5+4
=10+4=14
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1 . 2 + 1 . 3 + 1 .4 + 1 . 5
= 1 ( 2 + 3 + 4 + 5)
= 1 . 14
=14
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tính nhanh :
(1.25-0.25*5)*(1.1*1.2*1.3*1.4*1.5)
Tìm x:
|x+1.1|+|x+1.2|+|x+1.3|+|x+1.4|=5x
\(\left|x+1,1\right|+\left|x+1,2\right|+\left|x+1,3\right|+\left|x+1,4\right|=5x\)
Vì GTTĐ luôn lớn hơn hoặc bằng 0 với mọi x
\(\Rightarrow\left|x+1,1\right|+...+\left|x+1,4\right|\ge0\forall x\)
\(\Rightarrow5x\ge0\forall x\)
\(\Rightarrow x\ge0\)
\(\Leftrightarrow x+1,1+x+1,2+x+1,3+x+1,4=5x\)
\(\Leftrightarrow4x+5=5x\)
\(\Leftrightarrow5x-4x=5\)
\(\Rightarrow x=5\)
Vậy x = 5
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vì các giá trị tuyệt đối lớn hơn hoặc bằng 0=>5x lớn hơn hoặc bằng 0
=>x lớn hơn hoặc bằng 0
=>ta có thể phá dấu giá trj tuyệt đối
ta có x+1.1+x+1.2+x+1.3+x+1.4=5x
5=5x-4x=x
=>x=5
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(x+1)+(x+2)+(x+3)+(x+4)=5x
x.(1+2+3+4)=5x
x.5=5x
=>x chỉ có thể là 0 hoặc 1
Nha!!!!!!!!!!!
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1.1. Ann……………..handball very well. 1.2. I never……………..coffee. 1.3. The swimming pool……………..at 7.00 in the morning. 1.4. It……………..at 9.00 in the evening. 1.5. Bad driving……………..many accidents 1.6. My parents……………..in a very small flat. 1.7. My students……………..a little English...
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1.1. Ann……………..handball very well.
1.2. I never……………..coffee.
1.3. The swimming pool……………..at 7.00 in the morning.
1.4. It……………..at 9.00 in the evening.
1.5. Bad driving……………..many accidents
1.6. My parents……………..in a very small flat.
1.7. My students……………..a little English.
1.8. The Olympic Games……………..place every four years.
1.9. They are good students. They always……………..their homework.
1.10. I always……………..early in the morning.
1 plays
2 drink
3 opens
4 closes
5 causes
6 live
7 know
8 take
9 finish
10 get up
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1. Ann…plays…………..handball very well.
2. I never…drink…………..coffee.
3. The swimming pool………opens……..at 7.00 in the morning.
4. It……closes………..at 9.00 in the evening.
5. Bad driving…causes…………..many accidents
6. My parents…live…………..in a very small flat.
7. My students……speak………..a little English.
8. The Olympic Games…take…………..place every four years.
9. They are good students. They always……do………..their homework.
10. I always……wake up………..early in the morning.
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1. Ann…plays....handball very well.
2. I never…drink.......coffee.
3. The swimming pool…open…..at 7.00 in the morning.
4. It....closes…at 9.00 in the evening.
5. Bad driving…causes….many accidents
6. My parents…live….in a very small flat.
7. My students……speak…a little English.
8. The Olympic Games…take…...place every four year
9. They are good students. They always……do…their homework.
10. I always……wake up……early in the morning.
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