Tìm X
x/2-11/5=7/8.64/49
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a) x/2 - 11/5 = 7/8.64/49
=> x/2 - 11/5 = 8/7
=> x/2 = 8/7 + 11/5
=> x/2 = 117/35
=> x =117/35 x 2
=> x = 234/35
b) x/5 + 9/2 = 6/7 . 36/40
=> x/5 + 9/2 = 27/35
=> x/5 = 27/35 - 9/2
=> x/5 = -261/70
=> x = -261/70 x 5
=> x = -261/14
\(\frac{7}{8}\cdot\frac{64}{49}\)
\(=\frac{7\cdot8\cdot8}{8\cdot7\cdot7}\)
\(=\frac{8}{7}\)
Học tốt #
\(\frac{7}{8}.\frac{64}{49}\)
\(=\frac{7.8.8}{8.7.7}\)
\(=\frac{8}{7}\)
tk cho mình nha!
Mình nhanh nhất nhé.
\(\left(\dfrac{6:\dfrac{3}{5}-\dfrac{17}{16}.\dfrac{6}{7}}{\dfrac{21}{5}.\dfrac{10}{11}+\dfrac{57}{11}}-\dfrac{\left(\dfrac{3}{20}+\dfrac{1}{2}-\dfrac{1}{15}\right).\dfrac{12}{49}}{\dfrac{10}{3}+\dfrac{2}{9}}\right).x=\dfrac{215}{96}\)
\(\Rightarrow\left(\dfrac{\dfrac{509}{56}}{9}-\dfrac{\dfrac{7}{12}.\dfrac{12}{49}}{\dfrac{32}{9}}\right).x=\dfrac{215}{96}\)
\(\Rightarrow\left(\dfrac{509}{504}-\dfrac{\dfrac{1}{7}}{\dfrac{32}{9}}\right).x=\dfrac{215}{96}\)
\(\Rightarrow\left(\dfrac{509}{504}-\dfrac{9}{224}\right).x=\dfrac{215}{96}\)
\(\Rightarrow\dfrac{1955}{2016}.x=\dfrac{215}{96}\)
\(\Rightarrow x=\dfrac{215}{96}:\dfrac{1955}{2016}\)
\(\Rightarrow x=\dfrac{903}{391}\)
`[ 6 : 3/5 - 17/16 . 6/7 : 21/5 . 10/11 + 57/11 - (3/20 + 1/2 - 1/15) . 12/49 : 10/3 + 2/9 ] . x = 215/96`
`=>[ 6 . 5/3 - 17/16 . 6/7 . 5/21 . 10/11 + 57/11 - (3/20 + 1/2 - 1/15) . 12/49 . 3/10 + 2/9 ] . x = 215/96`
`=>[10- 51/56 . 6/7 . 5/21 . 10/11 + 57/11 - (3/20 + 1/2 - 1/15) . 12/49 . 3/10 + 2/9 ] . x = 215/96`
`=> [10- 153/196 . 5/21 . 10/11 + 57/11 - (3/20 + 1/2 - 1/15) . 12/49 . 3/10 + 2/9 ] . x = 215/96`
`=> [10- 255/1372 . 10/11 + 57/11 - (3/20 + 1/2 - 1/15) . 12/49 . 3/10 + 2/9 ] . x = 215/96`
`=> [10- 1275/7546 + 57/11 - (3/20 + 1/2 - 1/15) . 12/49 . 3/10 + 2/9 ] . x = 215/96`
`=> (10- 1275/7546 + 57/11 - 7/12. 12/49 . 3/10 + 2/9 ) . x = 215/96`
`=> ( 10- 1275/7546 + 57/11 -343/600 . 3/10 + 2/9 ) . x = 215/96`
`=> ( 10- 1275/7546 + 57/11 -343/2000 + 2/9 ) . x = 215/96`
`=>15,06357671 . x= 215/96`
`=> x= 215/96: 15,06357671`
`=>x= 0,1486754027`
Đề có phải như vậy không nhỉ ?
a) \(\frac{x}{2}-\frac{11}{5}=\frac{7}{8}.\frac{64}{49}\)
\(\frac{x}{2}-\frac{11}{5}=\frac{8}{7}\)
\(\frac{x}{2}=\frac{8}{7}+\frac{11}{5}\)
\(\frac{x}{2}=\frac{117}{35}\)
\(x=\frac{117}{35}\times2\)
\(x=\frac{234}{35}\)
b) \(\frac{y}{5}+\frac{9}{2}=\frac{6}{7}.\frac{36}{49}\)
\(\frac{y}{5}+\frac{9}{2}=\frac{216}{343}\)
\(\frac{y}{5}=\frac{216}{343}-\frac{9}{2}\)
\(\frac{y}{5}=\frac{-2655}{686}\)
\(y=\frac{-2655}{686}.5\)
\(y=\frac{-13275}{686}\)
ra kết quả to quá bn ạ! Bn xem lại giúp mk nha!
a/ (x-5)^2-49=0
<=>(x-5)2-72
<=>(x-5-7)(x-5+7)=0
<=>(x-12)(x+2)=0
<=>x-12=0 hoặc x+2=0
<=>x=12 hoặc x=-2
vậy x=12 hoặc x=-2
b/ (x+11)^2=121
<=>(x+11)2-121=0
<=>(x+11)2-112=0
<=>(x+11-11)(x+11+11)=0
<=>x(x+22)=0
<=>x=0 hoặc x+22=0
<=>x=0 hoặc x=-22
vậy x=0 hoặc x=-22
c/ x.(x+7)-6x-42=0
<=>x2+7x-6x-42=0
<=>x2+x-42=0
<=>x2-6x+7x-42=0
<=>x(x-6)+7(x-6)=0
<=>(x-6)(x-7)=0
<=>x-6=0 hoặc x-7=0
<=>x=6 hoặc x=7
vậy x=6;7
d/ x^4-2x^3+10x^2-20x=0
<=>x3(x-2)+10x(x-2)=0
<=>(x-2)(x3+10x)=0
<=>(x-2)x(x2+10)=0
<=>x-2=0 hoặc x=0 hoặc x2+10=0
<=>x=2 hoặc x=0 hoặc x2=-10(vô lí)
vậy x=2;0
a)(x-5)2-49=0
<=>(x-5-7)(x-5+7)=0
<=>(x-12)(x+2)=0
<=>x-12=0 hoặc x+2=0
<=>x=12 hoặc x=-2
b)(x+11)2=121
<=>(x+11)2-121=0
<=>(x+11-11)(x+11+11)=0
<=>x(x+22)=0
<=>x=0 hoặc x+22=0
<=>x=0 hoặc x=-22
c)x(x+7)-6x-42=0
<=>x(x+7)-(6x+42)=0
<=>x(x+7)-6(x+7)=0
<=>(x+7)(x-6)=0
<=>x+7=0 hoặc x-6=0
<=>x=-7 hoặc x=6
d)x4-2x3+10x2-20x=0
<=>x(x3-2x2+10x-20)=0
<=>x[(x3-2x2)+(10x-20)]=0
<=>x[x2(x-2)+10(x-2)]=0
<=>x(x-2)(x2+10)=0
Do x2>0=>x2+10>0
=>x(x-2)=0
<=>x=0 hoặc x-2=0
<=>x=0 hoặc x=2
a) \(\frac{X}{2}-\frac{11}{5}=\frac{7}{8}\cdot\frac{64}{49}\)
\(\Rightarrow\frac{x}{2}-\frac{11}{5}=\frac{8}{7}\)
\(\Rightarrow\frac{x}{2}=\frac{8}{7}+\frac{11}{5}\)
\(\Rightarrow\frac{x}{2}=\frac{117}{35}\)\(\Rightarrow x=\frac{117}{35}\cdot2=\frac{234}{35}\)
b)\(\frac{x}{5}+\frac{9}{2}=\frac{6}{7}\cdot\frac{36}{49}\)
\(\Rightarrow\frac{x}{5}+\frac{9}{2}=\frac{216}{343}\)
\(\Rightarrow\frac{x}{5}=\frac{216}{343}-\frac{9}{2}=\frac{-2655}{686}\)
\(\Rightarrow x=\frac{-2655}{686}\cdot5=\frac{-13275}{686}\)
x/2 - 11/5 = 7/8 . 64/49
x/2 - 11/5 = 8/7
x/2 =8/7 + 11/5
x/2 = 117/35
x = 2.117/35 ( tính chất phân số bằng nhau)
x = 234/35
x/5 + 9/2 = 6/7 . 36/49
x/5 + 9/2 = 216/343
x/5 = 216/343 - 9/2
x/5 = -2655/686
x = 5.(-2655)/686
x = -13275/686
a) (x - 1) + (x + 2) + (x - 3) + (x + 4) + (x - 5) + (x + 6) = 21
x - 1 + x + 2 + x - 3 + x + 4 + x - 5 + x + 6 = 21
6x + 3 = 21
6x = 21 - 3
6x = 18
x = 18 : 6
x = 3
b) (x - 1) + (x + 3) + (x - 5) + (x + 7) + (x - 9) + (x + 11) = 186
x - 1 + x + 3 + x - 5 + x + 7 + x - 9 + x + 11 = 186
6x + 6 = 186
6x = 186 - 6
6x = 180
x = 180 : 6
x = 30
ai nói thế, x = \(\frac{234}{35}\), tại sao không đem \(\frac{117}{35}\) nhân với 2 Trần Ngoc an