1+1+2+2+3+3+4+4+5+5+123+321+345+543=?
hoi hai nao .ai nhanh mk tick cho
cho mk hoi
a, 1+2+3+4+5+7+....+202020
b, 1+2-3-4+5-6-7+8-...-2011-2012-2103+2014
ai nhanh tay mk tick cho
123 ai nhanh nhat
345+543
tick
Số cần tìm là :
345 + 543 = 888
Đáp số : 888
ai nhanh mk sẽ tick cho :
Câu hỏi : Đội hình của Chelsea ra sân như thế nào :
A . 1-4-3-3
B.1-3-5-2
C.1-5-2-3
D.1-4-4-2
Ai nhanh mk sẽ tick cho
Lần đầu tiên mk nghe nói đội hình 1-3-5-2 , 5-2-3-1 mới đúng
a. (3/17 - 2/345 + 5/12 ) - ( -2/345 + 3/17 - 1/12 )
b. -(49/25 +5/36 - 4/123) + (49/25 - 4/123 - 1/36)
a) \(=\frac{3}{17}-\frac{2}{345}+\frac{5}{12}+\frac{2}{345}-\frac{3}{17}+\frac{1}{12}\)
\(=\left(\frac{3}{17}-\frac{3}{17}\right)+\left(\frac{2}{345}-\frac{2}{345}\right)+\left(\frac{5}{12}+\frac{1}{12}\right)\)
\(=\frac{6}{12}=\frac{1}{2}\)
b) \(=-\frac{49}{25}-\frac{5}{36}+\frac{4}{123}+\frac{49}{25}-\frac{4}{123}-\frac{1}{36}\)
\(=\left(-\frac{49}{25}+\frac{49}{25}\right)+\left(\frac{4}{123}-\frac{4}{123}\right)-\left(\frac{5}{36}+\frac{1}{36}\right)\)
\(=-\frac{6}{36}=-\frac{1}{6}\)
tìm x bt :
X +1+1+1+1+2+2+2+3+3+3+3+4+4+4+5+5+5+6+(-6)=500
Ai nhanh mk tick cho nhớ kb nha
X + 1 + 1 + 1 + 1 + 2 + 2 + 2 + 3 + 3 + 3 + 3 + 4 + 4 + 4 + 5 + 5 + 5 + 6 + ( -6 ) = 500
X + 49 = 500
X = 500 - 49
X = 451
k minh nhe minh tra loi nhanh nhat , dung nhat va day du nhat
\(\Leftrightarrow\) x + 1.4 + 2.3 + 3.4 + 4.3 + 5.3 = 500
\(\Leftrightarrow\) x + 4 + 6 + 12 + 12 + 15 = 500
\(\Leftrightarrow\)x + 49 = 500
\(\Leftrightarrow\)x = 451
Tk mình nha!!!>.<
Tính nhanh
1/2-2/3+3/4-4/5+5/6-6/7-5/6+4/5-3/4
ai giúp mình với mk tick cho!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
= \(\frac{1}{2}\)- \(\frac{2}{3}\)+ (\(\frac{3}{4}\)- \(\frac{3}{4}\)) + ( -\(\frac{4}{5}\)+ \(\frac{4}{5}\)) + ( \(\frac{5}{6}-\frac{5}{6}\)) - \(\frac{6}{7}\)
= \(\frac{1}{2}-\frac{2}{3}-0-0-0-\frac{6}{7}\)
= \(\frac{1}{2}-\frac{2}{3}-\frac{6}{7}\)
=\(\frac{21}{42}-\frac{28}{42}-\frac{36}{42}\)
= \(\frac{-43}{42}\)
công chúa hoa anh đào nhắn linh tinh mình sẽ báo cáo
đố: 1+3+4+5+345= ??
ai nhanh thì mềnh tick
Tính nhanh
a. 10 – 9 + 8 – 7 + 6 – 5 + 4 – 3 + 2 – 1
b. 1 + 3 + 5 + 7 + 9 + 10 + 8 + 6 + 4 + 2 + 0
ai tick cho mk mk tick lại cho
a. 10 – 9 + 8 – 7 + 6 – 5 + 4 – 3 + 2 – 1
= (10 – 9) + (8 – 7) + (6 – 5) + (4 – 3) + (2 – 1)
= 1 + 1 + 1 + 1 + 1
= 5
b. 1 + 3 + 5 + 7 + 9 + 10 + 8 + 6 + 4 + 2 + 0
= (0 +10) +(1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5
= 10 + 10 + 10 + 10 + 10 + 5
= 55
a) 10 - 9 + 8 - 7 + 6 - 5 + 4 - 3 + 2 - 1
= (10 - 9) + (8 - 7) + (6 - 5) + (4 - 3) + (2 - 1)
= 1 + 1 + 1 + 1 + 1
= 1 x 5
= 5
b) 1 + 3 + 5 + 7 + 9 + 10 + 8 + 6 + 4 + 2 + 0
= 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
= (0 + 10) x 11 : 2
= 10 x 11 : 2
= 5 x 11
= 55
a)234+(345-x)=500
b)456-(x+23)=326
c)(5.x-15):5=0
d)84-4.(2.x+1)=48
e)(x-76).54=0
f)(x-3).(x+4)=0
g)(x-6).(x-7)=0
h)(x-2).(x-3).(x-5)=0
ai nhanh mk tick cho
a) \(234+\left(345-x\right)=500\)
\(345-x=500-234\)
\(345-x=266\)
\(x=79\)
vay \(x=79\)
b) \(456-\left(x+23\right)=326\)
\(x+23=456-326\)
\(x+23=130\)
\(x=107\)
vay \(x=107\)
c) \(\left(5x-15\right):5=0\)
\(5x-15=0\)
\(5x=15\)
\(x=3\)
vay \(x=3\)
d) \(84-4\left(2x+1\right)=48\)
\(8x+4=84-48\)
\(8x+4=36\)
\(8x=32\)
\(x=4\)
vay \(x=4\)
e) \(\left(x-76\right).54=0\)
\(x-76=0\)
\(x=76\)
vay \(x=76\)
f) \(\left(x-3\right)\left(x+4\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x+4=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)
vay \(\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)
g) \(\left(x-6\right)\left(x-7\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-6=0\\x-7=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
vay \(\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
h) \(\left(x-2\right)\left(x-3\right)\left(x-5\right)=0\)
\(\Rightarrow x-2=0\Rightarrow x=2\)hoac \(\orbr{\begin{cases}x-3=0\\x-5=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=5\end{cases}}\)
vay \(x=2\)hoac \(\orbr{\begin{cases}x=3\\x=5\end{cases}}\)
câu a,b thì chắc bn biết
c)(5.x-15):5=0
(5.x-15) =0.5
(5.x-15) =0
5.x =0+15
5.x =15
x =15:5
x =3
d)84-4.(2.x+1)=48
4.(2.x+1)=84-48
4.(2.x+1)=36
2.x+1 =36:4
2.x+1 =9
2.x =9-1
2.x =8
x =8:2
x =4
e)(x-76).54=0
x-76 =0:54
x-76 =0
x =0+76
x =76
f) (x-3).(x+4)=0
\(\Rightarrow\orbr{\begin{cases}x-3=0\\x+4=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)
Vậy x=3 hoặc x=-4
câu g,h làm tương tự