a (1/2 + 3/4 ) x 4
b (5/7 - 1/4 ) x 7
c 1/2 x 3/4 +1/2 x 1/4
d 11/3 x 26/7 - 26/7 x 8/3
Giải hộ giúp mình 4 phần này huhu
Thuc hien phep tinh
a)1/8+3/8 b)-2/5.5/17
2)26/3.2017/2018+26/3.1/2018-5/3 B= 11/3/13 +(2/4/7-5/3/13)
bai 3
a)4/5.x=4/7 b)-4/8=x/-10=-7/y
4) chung to rằng D=1/2^2+1/3^2+1/4^2+.,..+1/10^2<1
minh mong các ban sẽ giúp minh các bài toán này nhé ,mình đang gấp lắm
1. Tính: C) 1/2 x 3/4 + 1/2 x 1/4. D) 11/3 x 26/7 - 26/7 x 8/3.
\(C,\dfrac{1}{2}.\dfrac{3}{4}+\dfrac{1}{2}.\dfrac{1}{4}=\dfrac{1}{2}.\left(\dfrac{3}{4}+\dfrac{1}{4}\right)\)
\(=\dfrac{1}{2}.\dfrac{4}{4}=\dfrac{1}{2}.1=\dfrac{1}{2}\)
\(D,\dfrac{11}{3}.\dfrac{26}{7}-\dfrac{26}{7}.\dfrac{8}{3}=\dfrac{26}{7}.\left(\dfrac{11}{3}-\dfrac{8}{3}\right)\)
\(=\dfrac{26}{7}.\dfrac{3}{3}=\dfrac{26}{7}.1=\dfrac{26}{7}\)
mn giải giúp mk bài này vs
1) Tính
a;11/125-17/18-5/7+4/9+17/14
b;1-1/2+2-2/3+3-3/4+4-1/4-3-1/3-2-1/2-1
c;26:[3:0,1/25*2+0,25*4/6,84:3,42
2)Tìm x,Biết
a)x+1/3=2/5-1/3
b)3/7-x=1/4-(-3/5)
c)11/33-(5/42-x)=-(15/28-11/3)
d)|x+4/5|-|-3,75|=-|-2,15|
Tính :
2/5 + 11/15 =
7/8 - 7/9 =
11/13 x 26/31 =
16/24 : 4 =
30 : 6/5 =
9/16 : 4 =
1/2 : 1/3 x 8/15 =
\(\dfrac{2}{5}+\dfrac{11}{15}=\dfrac{6}{15}+\dfrac{11}{15}=\dfrac{17}{15}\)
\(\dfrac{7}{8}-\dfrac{7}{9}=\dfrac{63}{72}-\dfrac{56}{72}=\dfrac{7}{72}\)
\(\dfrac{11}{13}\times\dfrac{26}{31}=\dfrac{22}{31}\)
\(\dfrac{16}{24}:4=\dfrac{16}{24}\times\dfrac{1}{4}=\dfrac{4}{24}=\dfrac{1}{6}\)
\(30:\dfrac{6}{5}=30\times\dfrac{5}{6}=25\)
\(\dfrac{9}{16}:4=\dfrac{9}{16}\times\dfrac{1}{4}=\dfrac{9}{64}\)
\(\dfrac{1}{2}:\dfrac{1}{3}\times\dfrac{8}{15}=\dfrac{1}{2}\times3\times\dfrac{8}{15}=\dfrac{4}{5}\)
2/5 + 11/15 = 17/15
7/8 - 7/9 = 7/72
11/13 x 26/31 = 22/31
16/24 : 4 = 1/6
30 : 6/5 = 25
9/16 : 4 = 9/64
1/2 : 1/3 x 8/15 = 3/2 x 8/15 = 4/5
a ) 2/5 + 11/15
b ) 7/8 -7/9
c ) 11/13 x 26/31
d ) 1/2 : 1/3 x 2/5
mình chọn 4 người trò truyện
a) \(\dfrac{2}{5}+\dfrac{11}{15}=\dfrac{6}{15}+\dfrac{11}{15}=\dfrac{17}{15}\)
b) \(\dfrac{7}{8}-\dfrac{7}{9}=\dfrac{63}{72}-\dfrac{56}{72}=\dfrac{7}{72}\)
c) \(\dfrac{11}{13}\cdot\dfrac{26}{31}=\dfrac{26}{13}\cdot\dfrac{11}{31}=\dfrac{22}{31}\)
d) \(\dfrac{1}{2}:\dfrac{1}{3}\cdot\dfrac{2}{5}=\dfrac{1}{2}\cdot3\cdot\dfrac{2}{5}=\dfrac{3}{5}\)
a ) 2/5 + 11/15 = 6/15 + 11/ 15 = 17/15.
b ) 7/8 -7/9 = 63/72 -56/72 = 7/72.
c ) 11/13 x 26/31 = 22/31
d ) 1/2 : 1/3 x 2/5= 1/2 x 3/1 x 2/5 = 3/5
đúng thì tick mình nhé!!! cảm ơn bạn
0,75 x 26 + 49 x 3/4 + 3/4 x24 + 0,75
3/7 x 1/2 + 0,5 x 4/7 + 0,125
1/3 x 4/5 + 2/3 + 1/3 + 6/5 x 16 + 84 x 1/8
Giúp mk giải chích xác
a) \(0,75\times26+49\times\frac{3}{4}+\frac{3}{4}\times24+\) \(0,75\)
\(=\) \(0,75\times\left(26+1\right)+\frac{3}{4}\times\left(49+24\right)\)
\(=\) \(\frac{3}{4}\times27+\frac{3}{4}\times73\)
\(=\) \(\frac{3}{4}\times\left(27+73\right)\)
\(=\)\(\frac{3}{4}\times100=75\)
b) câu b,c làm tương tự
a) x : 4/5 = 28/5 : 5/4
b) 8/15 . x + 5/7 = 2/21
c) 7/8-1/6.x = 1/4
d) [ 3 và 1/2 - 2.x ].4/3=7 và 1/3
e) | x-1/2 |-3/4=0
f) [2.x +1/3].[5/7-x]=0
g) x-2/121=-11/6.6/7
h) (-3).x +0,75.x=-1 và 3/4
i) [x+1/5]^2 + 17/25 = 26/25
j) |2x-1| = (-4)^2
a, 2/3 x - 1/2 x = 5/12
b, ( x . 6 và 2/7 + 3/7 ) . 2 và 1/5 - 3/7 = - 2
c, x . 3 và 1/4 + ( - 7/6 ) . x - 1 và 2/3 = 5/12
d, 5 và 8/17 : x + ( - 4/ 17 ) : x + 3 và 1/7 : 17 và 1/3 = 4/11
e, ( x + 1/5 )2 + 17/25 = 26/25
g, - 1 và 5/27 - ( 3x - 7/9 )3 = - 24 /27
a, 3/5 + X = 4/3
b, X + 5/6 =1/7
c, X x 3/8 = 3/4
d, 4/5 x X = 3/7
a) \(\dfrac{3}{5}+x=\dfrac{4}{3}\)
\(\Leftrightarrow x=\dfrac{4}{3}-\dfrac{3}{5}\)
\(\Leftrightarrow x=\dfrac{20}{15}-\dfrac{9}{15}\)
\(\Leftrightarrow x=\dfrac{11}{15}\)
b) \(x+\dfrac{5}{6}=\dfrac{1}{7}\)
\(\Leftrightarrow x=\dfrac{1}{7}-\dfrac{5}{6}\)
\(\Leftrightarrow x=\dfrac{6}{42}-\dfrac{35}{42}\)
\(\Leftrightarrow x=-\dfrac{29}{42}\)
c) \(x\times\dfrac{3}{8}=\dfrac{3}{4}\)
\(\Leftrightarrow x=\dfrac{3}{4}:\dfrac{3}{8}\)
\(\Leftrightarrow x=\dfrac{3}{4}\times\dfrac{8}{3}\)
\(\Leftrightarrow x=2\)
d) \(\dfrac{4}{5}\times x=\dfrac{3}{7}\)
\(\Leftrightarrow x=\dfrac{3}{7}:\dfrac{4}{5}\)
\(\Leftrightarrow x=\dfrac{3}{7}\times\dfrac{5}{4}\)
\(\Leftrightarrow x=\dfrac{15}{28}\)
a, \(\dfrac{3}{5}+x=\dfrac{4}{3}\Leftrightarrow x=\dfrac{4}{3}-\dfrac{3}{5}=\dfrac{20-9}{15}=\dfrac{11}{15}\)
b, \(x+\dfrac{5}{6}=\dfrac{1}{7}\Leftrightarrow x=\dfrac{1}{7}-\dfrac{5}{6}=\dfrac{6-35}{42}=\dfrac{-29}{42}\)
c, \(\dfrac{3x}{8}=\dfrac{3}{4}\Leftrightarrow\dfrac{3x}{8}=\dfrac{6}{8}\Rightarrow3x=6\Leftrightarrow x=2\)
d, \(\dfrac{4x}{5}=\dfrac{3}{7}\Leftrightarrow\dfrac{28x}{35}=\dfrac{15}{35}\Rightarrow x=\dfrac{15}{28}\)
a, \(\dfrac{3}{5}\) + \(X\) = \(\dfrac{4}{3}\)
\(X\) = \(\dfrac{4}{3}\) - \(\dfrac{3}{5}\)
\(X\) = \(\dfrac{11}{15}\)
b, \(X\) + \(\dfrac{5}{6}\) = \(\dfrac{1}{7}\)
\(X\) = \(\dfrac{1}{7}\) - \(\dfrac{5}{6}\)
\(X\) = -\(\dfrac{29}{42}\)
c, \(X\) x \(\dfrac{3}{8}\) = \(\dfrac{3}{4}\)
\(X\) = \(\dfrac{3}{4}\) : \(\dfrac{3}{8}\)
\(X\) = 2
d, \(\dfrac{4}{5}\) x \(X\) = \(\dfrac{3}{7}\)
\(X\) = \(\dfrac{3}{7}\) : \(\dfrac{4}{5}\)
\(X\) = \(\dfrac{15}{28}\)
#Yu