3/2*3*4 + 3/3*4*5 + 3/4*5*6 +..............+ 3/100*101*102
giup minh ti minh dang can gap traong 1 tieng
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28 tháng 10 2017 lúc 14:39
chung minh rang
\(\dfrac{1}{3}+\dfrac{2}{3^2}+\dfrac{3}{3^3}+\dfrac{4}{3^4}+....+\dfrac{100}{3^{100}}\) < \(\dfrac{3}{4}\)
giup minh nhe minh dang can gap
C=3+(3/1+2)+(3/1+2+3)+(3/1+2+3+4)+...+(3/1+2+3+...+100)
minh dang can gap mong cac ban giup minh T_T
tim x
5/6x−3/4=−1/4+2/3
−1va1/2−2/3x=5/6−(−2/5)
(4/5:x+1,5):2/3=−1,5
4/3x−2/3=1/4−x
giup minh nhe minh dang can gap
1*2*3*4*5*6*7*8*9*...................................*10000000000000000*.......................................................*999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 ket qua la?
minh dang can gap
a. x \(\div\)( 1/1*3 + 1/3*5 + ...... + 1/101*103 ) =1 .
b.( 1/1*2 + 1/2*3 + 1/3*4 + ........ + 1/11*12) * x =2
c. x : 3/4 = 2x * 7/3 +5
Cac ban giai theo dang tim x nha . Cam on nhieu. Nhanh nhe vi minh can gap
19 tháng 9 2017 lúc 12:09
tim x
\(\dfrac{5}{6}x-\dfrac{3}{4}=\dfrac{-1}{4}+\dfrac{2}{3}\)
\(-1\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{5}{6}-\left(\dfrac{-2}{5}\right)\)
\(\left(\dfrac{4}{5}:x+1,5\right):\dfrac{2}{3}=-1,5\)
\(\dfrac{4}{3}x-\dfrac{2}{3}=\dfrac{1}{4}-x\)
giup minh nhe minh dang can gap
\(\dfrac{5}{6}x-\dfrac{3}{4}=\dfrac{-1}{4}+\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{5}{6}x=\dfrac{7}{6}\)
\(\Rightarrow x=\dfrac{7}{5}\)
b) \(-1\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{5}{6}-\left(\dfrac{-2}{5}\right)\)
\(\Leftrightarrow\dfrac{2}{3}x=-\dfrac{41}{15}\)
\(\Rightarrow x=-\dfrac{41}{10}\)
c) \(\left(\dfrac{4}{5}:x+1,5\right):\dfrac{2}{3}=-1,5\)
\(\Leftrightarrow\dfrac{8+15x}{10x}.\dfrac{3}{2}=\dfrac{-3}{2}\)
\(\Leftrightarrow\dfrac{24+45x}{20x}=\dfrac{-3}{2}\)
\(\Leftrightarrow-60x=48+90x\)
\(\Rightarrow x=-0,32\)
d) \(\dfrac{4}{3}x-\dfrac{2}{3}=\dfrac{1}{4}-x\)
\(\Leftrightarrow\dfrac{4x-2}{3}=\dfrac{1-4x}{4}\)
\(\Rightarrow16x-8=3-12x\)
\(\Rightarrow x=\dfrac{11}{28}\)
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a,\(\left(\frac{-1}{2}\right)^3-\left(\frac{2}{5}x+\frac{1}{3}\right)=3\)
b,\(-2\frac{1}{3}-\left(4\frac{1}{6}-\frac{4}{3}+1\frac{1}{2}\right)\)
AI GIAI DUOC MINH CHO 10 TICK.NHANH NHA MINH DANG CAN GAP
a) -1/8 -2x/5-1/3=3
-2x/5=3+1/8+1/3
-2x/5=83/24
-2x=(83×5)/24=415/24
x = (415÷-2)/24= -415/48
b) -7/3 -(25/6 -4/3+ 3/2)
= -7/3 -13/3 = -20/3
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ai ma co 10 k ban chac ban phai lap chuc nink thui
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a 4/7 + 7/20 + 1/4 =... ; b) 21, 15 + 3/5 + 3/4 = ... giup minh nha minh dang can nop bai gap vao ngay mai
a) 4/7 + 7/20 + 1/4 b) 21,15 + 3/5 + 3/4
= 4/7 + 7/20 + 5/20 = 21,15 + 0,6 + 0,75
= 4/7 + 3/5 = 22,5
= 20/35 + 21/35
= 41/35
a,\(\frac{4}{7}\) \(+\frac{7}{20}\) \(+\frac{1}{4}\)
\(=\frac{4}{7}\) \(+\frac{7}{20}\) \(+\frac{5}{20}\)
\(=\frac{4}{7}\) \(+\frac{3}{5}\)
\(=\frac{20}{35}\)\(+\frac{21}{35}\)
\(=\frac{41}{35}\)
#Hemingson
b, \(21,15\) \(+\frac{3}{5}\) \(+\frac{3}{4}\)
\(=21,15+0,6+0,75\)
\(=22,5\)
#Hemingson
Tinh: S=1-2-3-4-5-...-199-200-201-202.
GIUP MINH VOI, MINH DANG CAN GAP.
S= 2-1-2-3-4-....-201-202
= 2-(1+2+3+4+....+202)
=2- (202:2)( 202+1)
= 2- 101.203