giúp mình với ạ
1-2+3-4+5-...-200+201-202
30-(x+1)=-17
x.(|15|-10)=5^3
2x+5=7-x-5
a)13/20+3/5+x=5/6
b)x+1/3=2/5-(-1/3)
c)-5/8-x=-3/20-(-1/6)
d)3/5-x=-1/4+7/10
e)-3/7-x=4/5+-2/3
g)-5/6-x=7/12+-1/3
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP. CẢM ƠN MỌI NGƯỜI!
CÔ NGUYỄN THỊ THƯƠNG HOÀI GIÚP EM VỚI Ạ
a) \(\dfrac{13}{20}+\dfrac{3}{5}+x=\dfrac{5}{6}\)
\(\Rightarrow\dfrac{5}{4}+x=\dfrac{5}{6}\)
\(\Rightarrow x=\dfrac{5}{6}-\dfrac{5}{4}\)
\(\Rightarrow x=\dfrac{-5}{12}\)
b) \(x+\dfrac{1}{3}=\dfrac{2}{5}-\dfrac{-1}{3}\)
\(\Rightarrow x+\dfrac{1}{3}=\dfrac{11}{15}\)
\(\Rightarrow x=\dfrac{11}{15}-\dfrac{1}{3}\)
\(\Rightarrow x=\dfrac{2}{5}\)
c)\(\dfrac{-5}{8}-x=\dfrac{-3}{20}-\dfrac{-1}{6}\)
\(\dfrac{-5}{8}-x=\dfrac{1}{60}\)
\(\Rightarrow x=\dfrac{-5}{8}-\dfrac{1}{60}\)
\(\Rightarrow x=\dfrac{-77}{120}\)
d) \(\dfrac{3}{5}-x=\dfrac{1}{4}+\dfrac{7}{10}\)
\(\Rightarrow\dfrac{3}{5}-x=\dfrac{19}{20}\)
\(\Rightarrow x=\dfrac{3}{5}-\dfrac{19}{20}\)
\(\Rightarrow x=\dfrac{-7}{20}\)
e) \(\dfrac{-3}{7}-x=\dfrac{4}{5}+\dfrac{-2}{3}\)
\(\Rightarrow\dfrac{-3}{7}-x=\dfrac{2}{15}\)
\(\Rightarrow x=\dfrac{-3}{7}-\dfrac{2}{15}\)
\(\Rightarrow x=\dfrac{-59}{105}\)
g) \(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)
\(\Rightarrow\dfrac{-5}{6}-x=\dfrac{1}{4}\)
\(\Rightarrow x=\dfrac{-5}{6}-\dfrac{1}{4}\)
\(\Rightarrow x=\dfrac{-13}{12}\)
1/2*2/3*3/4*4/5*......200/201*x = 1/402
Mình cần gấp ,giúp mình với
Ta có:
\(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{200}{201}\times x=\frac{1}{402}\)
\(\Rightarrow\frac{1}{201}\times x=\frac{1}{402}\Rightarrow x=\frac{1}{402}:\frac{1}{201}=\frac{1}{2}\)
Vậy x = 1/2.
k vs kb cho tớ nha!
1/2 . 2/3 . 3/4 .... . 200/201 . x = 1/402
\(\frac{1.2.3...200}{2.3.4...201}\). x = 1/402
1/201 . x = 1/402
x = 1/402 : 1/201
x = 1/2
Đặt \(C=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}....\frac{200}{201}\)
\(\Rightarrow C=\frac{1.2.3...200}{2.3.4...201}\)
\(\Rightarrow C=\frac{1}{201}\)
\(\Leftrightarrow\frac{1}{201}.x=\frac{1}{402}\)
\(\Rightarrow x=\frac{1}{2}=0,5\)
-1\5 + 5\3 , -3\4- 7\10 , 15 \ -8 x 4\5 , - 30. \7 : 5\1
mn giải hẳn ra cho mình với ạ
a: =-3/15+25/15=22/15
b: =-15/20-14/20=-29/20
c: =-15/8*4/5=-12/8=-3/2
d: =-30/7*1/5=-30/35=-6/7
Câu 1: 200:(15 - x ) - 5 = 15. Câu2: 22- 63 :( x-5 ) = 1. Câu 3: 5/6 - ( 4/5 : x - 3/4 ) x 2/3 = 1/2 Câu 4 5/6 :10/9 + ( x nhân 2/3 - 3/5 ) : 2/5 = 5/4 câu 5 2/3 + ( 3/5 - 2/5 nhân x ) : 3/4 = 4/3 ..... Giúp mình nhé
khỏi chép đề nha
a\Câu 1:
200 : ( 15 - x ) = 15 + 5
200 : ( 15 - x ) = 20
15 - x = 200 : 20
15 - x = 10
x = 15 - 10
x = 5
Câu 2:
63 : ( x - 5 ) = 22 -1
63 : ( x - 5 ) = 21
x - 5 = 63 : 21
x - 5 = 3
x = 3 + 5
x = 8
1/ 1-4+7-10+...-x=-75
2/ -1+3-5+7-...+x=1000
3/ 6-8+10-12+...-x=-200
4/ 1-5+9-13+...-x=-400
Giúp mình với mai mình nộp rồi.......
Em chào chị Như ạ em tên là Nam Anh
a)(-0,25).4/17.(-3 5/21).(-7/12)
b) (-2/5).4/15+(-3/10).4/15
c)21-3 3/4:(3/8-1/6)
d) (-3/4+2/5):3/7+(3/5+-1/4):3/7
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP VÀO SÁNG NAY. CẢM ƯN NỌI NGƯỜI NHÌU!
CÔ NGUYỄN THỊ THƯƠNG HOÀI GIÚP EM VỚI Ạ
a) \(...=-\dfrac{1}{4}.\dfrac{4}{17}.\left(-\dfrac{63}{21}\right).\left(-\dfrac{7}{12}\right)\)
\(=-\dfrac{1}{17}.\dfrac{63}{21}.\dfrac{7}{12}\)
\(=-\dfrac{7}{68}\)
b) \(...=-\dfrac{2}{5}.\dfrac{4}{15}-\dfrac{3}{10}.\dfrac{4}{15}\)
\(=\dfrac{4}{15}\left(-\dfrac{2}{5}-\dfrac{3}{10}\right)\)
\(=\dfrac{4}{15}\left(-\dfrac{4}{10}-\dfrac{3}{10}\right)\)
\(=\dfrac{4}{15}.\left(-\dfrac{7}{10}\right)=-\dfrac{14}{75}\)
c) \(...=21-\dfrac{15}{4}:\left(\dfrac{9}{24}-\dfrac{4}{24}\right)\)
\(=21-\dfrac{15}{4}:\dfrac{5}{24}\)
\(=21-\dfrac{15}{4}.\dfrac{24}{5}\)
\(=21-3.6=3\)
d) \(...=\left(-\dfrac{3}{4}+\dfrac{2}{5}\right).\dfrac{7}{3}+\left(\dfrac{3}{5}-\dfrac{1}{4}\right).\dfrac{7}{3}\)
\(=\dfrac{7}{3}\left(-\dfrac{3}{4}+\dfrac{2}{5}+\dfrac{3}{5}-\dfrac{1}{4}\right)\)
\(=\dfrac{7}{3}\left(-\dfrac{3}{4}-\dfrac{1}{4}+\dfrac{2}{5}+\dfrac{3}{5}\right)\)
\(=\dfrac{7}{3}\left(-1+1\right)=0\)
a)1/2-(x+1/3)=5/6
b)3/4-(x+1/2)=4/5
c)3/35-(3/5+x)=2/7
d)2/3.x=4/27
e)-3/5.x=21/10
GIÚP MÌNH VỚI Ạ. MÌNH CẦN GẤP VÀO SÁNG MAI. CẢM ƠN MỌI NGƯỜI!
a) \(\dfrac{1}{2}-\left(x+\dfrac{1}{3}\right)=\dfrac{5}{6}\)
\(\Rightarrow x+\dfrac{1}{3}=\dfrac{1}{2}-\dfrac{5}{6}\)
\(\Rightarrow x+\dfrac{1}{3}=\dfrac{-1}{3}\)
\(\Rightarrow x=\dfrac{-1}{3}-\dfrac{1}{3}\)
\(\Rightarrow x=\dfrac{-2}{3}\)
b)\(\dfrac{3}{4}-\left(x+\dfrac{1}{2}\right)=\dfrac{4}{5}\)
\(\Rightarrow x+\dfrac{1}{2}=\dfrac{3}{4}-\dfrac{4}{5}\)
\(\Rightarrow x+\dfrac{1}{2}=\dfrac{-1}{20}\)
\(\Rightarrow x=\dfrac{-1}{20}-\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{-11}{20}\)
c) \(\dfrac{3}{35}-\left(\dfrac{3}{5}+x\right)=\dfrac{2}{7}\)
\(\Rightarrow\dfrac{3}{5}+x=\dfrac{3}{35}-\dfrac{2}{7}\)
\(\Rightarrow\dfrac{3}{5}+x=\dfrac{-1}{5}\)
\(\Rightarrow x=\dfrac{-1}{5}-\dfrac{3}{5}\)
\(\Rightarrow x=\dfrac{-4}{5}\)
d)\(\dfrac{2}{3}.x=\dfrac{4}{27}\)
\(\Rightarrow x=\dfrac{4}{27}:\dfrac{2}{3}\)
\(\Rightarrow x=\dfrac{2}{9}\)
e) \(\dfrac{-3}{5}.x=\dfrac{21}{10}\)
\(\Rightarrow x=\dfrac{21}{10}:\dfrac{-3}{5}\)
\(\Rightarrow x=\dfrac{-7}{2}\)
a) ( 21/22 + 3/5 + -21/22 ) : 1 2/5 9/17 x 8/5 - 9/17 x 3/5 + 8/17
X - 3/10 = 7/15 x 3/15
a: \(=\dfrac{3}{5}:\dfrac{7}{5}=\dfrac{3}{5}\cdot\dfrac{5}{7}=\dfrac{3}{7}\)
b: \(=\dfrac{9}{17}\left(\dfrac{8}{5}-\dfrac{3}{5}\right)+\dfrac{8}{17}\)
=9/17+8/17=1
c: =>x-3/10=7/15*1/5=7/75
=>x=7/75+3/10=59/150
tính giá trị biểu thức
[a] 1/3-2/15+14/15
[b] 3/5 +4-6/7
[c] 1/7+2/9+3/10+7/9+6/7+7/10
[d]3/4+5/8-5/6
mình cần gấp,các bạn trả lời nhanh giúp mình với ạ
\(\dfrac{1}{3}\)-\(\dfrac{2}{15}\)+\(\dfrac{14}{15}\)=\(\dfrac{3}{15}\)-\(\dfrac{2}{15}\)+\(\dfrac{14}{15}\)
=\(\dfrac{13}{15}\)
\(\dfrac{3}{5}\)+4-\(\dfrac{6}{7}\)=\(\dfrac{3}{5}\)+\(\dfrac{20}{5}\)-\(\dfrac{6}{7}\)=\(\dfrac{23}{5}\)-\(\dfrac{6}{7}\)=\(\dfrac{161}{35}\)-\(\dfrac{30}{35}\)=\(\dfrac{131}{35}\)