3/4 x 6/7 - 1/4 x 6/7 + 2 và 1/3 = ?
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\(\left(x-\dfrac{4}{7}\right):-\dfrac{1}{3}=1\)
\(\Rightarrow x-\dfrac{4}{7}=1\cdot-\dfrac{1}{3}\)
\(\Rightarrow x-\dfrac{4}{7}=-\dfrac{1}{3}\)
\(\Rightarrow x=-\dfrac{1}{3}+\dfrac{4}{7}\)
\(\Rightarrow x=\dfrac{5}{12}\)
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\(\dfrac{2}{3}-\dfrac{7}{4}:x=\dfrac{5}{6}\)
\(\Rightarrow\dfrac{7}{4}:x=\dfrac{2}{3}-\dfrac{5}{6}\)
\(\Rightarrow\dfrac{7}{4}:x=-\dfrac{1}{6}\)
\(\Rightarrow x=\dfrac{7}{4}:-\dfrac{1}{6}\)
\(\Rightarrow x=-\dfrac{21}{2}\)
(x - 4/7) : (-1/3) = 1
x - 4/7 = -1/3
x = -1/3 +4/7
x = 5/21
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2/3 + 7/4 : x = 5/6
7/4 : x = 5/6 - 2/3
7/4 : x = 1/6
x = 7/4 : 1/6
x = 21/2
= 51/20
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= 3/14
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= 4/7 - 2/7
= 2/7
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= 17/45
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= 2/3
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= 2 x 1/4
= 1/2
a: =>4/3x=7/9-4/9=1/3
=>x=1/4
b: =>5/2-x=9/14:(-4/7)=-9/8
=>x=5/2+9/8=29/8
c: =>3x+3/4=8/3
=>3x=23/12
hay x=23/36
d: =>-5/6-x=7/12-4/12=3/12=1/4
=>x=-5/6-1/4=-10/12-3/12=-13/12
1/ 10(X-7)-8(X+5)=6(-5)+24
10x - 70 - 8x - 40 = -30 +24
2x - 110 = -6
2x = 104
x=52
2/ 8(X-|-7|)-6(X-2)=|-8|.6-50
8(x - 7) - 6(x-2) = 8.6 - 50
8x - 56 - 6x +12 =48 -50
2x - 44 = -2
2x = 42
x=21
3/ 2(4X-8)-7(3+X)=|-4|(3-2)
8x-16 - 21 - 7x = 4.1
x-37=4
x=41
4/ 12(X-4)=6(x-2)-16(X+3)=7|-4|
12x - 48 = 6x - 12 - 16x -48 =7.4
12x - 48 = 28
12x=76
x=19/3
5/ 4(X-5)-7(5-X)+10(5-X)=-3
4x - 20 -35 +7x + 50 -10x = -3
x - 5 = -3
x = -2
Chúc bạn học tốt!
\(\dfrac{1}{4}\cdot\dfrac{1}{3}+\dfrac{1}{6}\cdot\dfrac{1}{4}+\dfrac{1}{4}\cdot\dfrac{1}{7}\\ =\dfrac{1}{4}\cdot\left(\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{7}\right)\\ =\dfrac{1}{4}\cdot\dfrac{9}{14}\\ =\dfrac{9}{56}\)
1: 2*2*2*2*2*2=2^6
2: x*x*x*x=x^4
3: =7^4*6^4=42^4
4: =5^2*3^2*4^2=60^2
5: =2*3^2*5^5
6: =10^3*10^3=10^6
1) = \(\frac{3}{5}\)
2) =\(\frac{6}{7}\)
3)\(\frac{9}{13}\)
4)\(\frac{4}{13}\)
\(\dfrac{3}{4}.\dfrac{6}{7}-\dfrac{1}{4}.\dfrac{6}{7}+2\dfrac{1}{3}\)
\(=\dfrac{58}{21}\)
58/21 nha bn