x + x * 1/3 : 2/9 + x : 2/7 = 252
tìm X : X + X x 1/3 :2/9 + X:2/7=252
y+y x 1/3 : 2/9 + y :2/7 = 252
y x 1 + y x (1/3 x 9/2 ) + y x 7/2 = 252
y x 1/1 + y x 3/2 + y x 7/2 = 252
y x (1/1 + 3/2 + 7/2 ) = 252
y x 6 = 252
y = 252 : 6
y = 42
x+x*1/3:2/9+x:2/7=252
tìm x :a,5/9xX-1=8/9,b,X+Xx1/3:2/9+x:2/7=252,c,2/5+3/5xX=2/3
a)\(\frac{5}{9}\times x-1=\frac{8}{9}\)
\(\frac{5}{9}\times x=\frac{8}{9}+1\)
\(\frac{5}{9}\times x=\frac{17}{9}\)
\(x=\frac{17}{9}:\frac{5}{9}\)
\(x=\frac{17}{5}\)
b)\(x+x\times\frac{1}{3}:\frac{2}{9}+x:\frac{2}{7}=252\)
\(x+x\times\frac{3}{2}+x:\frac{2}{7}=252\)
\(x.1+x.\frac{3}{2}+x.\frac{7}{2}=252\)
\(x\left(1+\frac{3}{2}+\frac{7}{2}\right)=252\)
\(x\times6=252\)
\(x=252:6\)
\(x=42\)
a,5/9.x-1=8/9
5/9.x=17/9
x=17/5
b,x+x.1/3:2/9+x:2/7=252
x+x.1/3.9/2+x.7/2=252
x(1+1/3.9/2+7/2)=252
x.6=252
x=42
Bài 2: Tìm x biết:
1,x\(^2\)+4x+4=25
2,(5-2x)\(^2\)-16=0
3,(x-3)\(^3\)-(x-3)(x\(^2\)+3x+9)+9(x+1)\(^2\)=15
4,3(x+2)\(^2\)+(2x-1)\(^2\)-7(x-3)9x+3)=36
5,(x-3)(x\(^2\)+3x+9)+x(x+2)(2-x)=1
6,(2x+1)\(^2\)-4(x+2)\(^2\)=9
7,(x+3)\(^{^{ }2}\)-(x-4)(x+8)=1
1: =>x^2+4x-21=0
=>(x+7)(x-3)=0
=>x=3 hoặc x=-7
2: =>(2x-5-4)(2x-5+4)=0
=>(2x-9)(2x-1)=0
=>x=9/2 hoặc x=1/2
3: =>x^3-9x^2+27x-27-x^3+27+9(x^2+2x+1)=15
=>-9x^2+27x+9x^2+18x+9=15
=>18x=15-9-27=-21
=>x=-7/6
6: =>4x^2+4x+1-4x^2-16x-16=9
=>-12x-15=9
=>-12x=24
=>x=-2
7: =>x^2+6x+9-x^2-4x+32=1
=>2x+41=1
=>2x=-40
=>x=-20
X + X x 1/3 : 2/9 + X : 2/7 = 252 . Tìm X
tính giúp nhé! ghi rõ lời giải. OK.
tìm x
a) x+x* 1/3 : 2/9 + x :2/7= 252
b) (x+2)+ (x+5)+(x+8)+...+(x+32)=198
Ta có : (x + 2) + (x + 5) + (x + 8) + ...... + (x + 32) = 198
<=> (x + x + x + ...... + x) + (2 + 5 + 8 + ....... + 32) = 198
<=> 11x + 187 = 198
=> 11x = 198 - 187
=> 11x = 11
=> x = 1
a .
\(x+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(x+x\times\frac{3}{2}+x=252\times\frac{2}{7}\)
\(x+x\times\frac{3}{2}+x=72\)
\(x=72\div\frac{3}{2}-3x\)
\(x=48-3x\)
\(x=45\)
\(\left(x+2\right)+\left(x+5\right)+\left(x+8\right)+....\left(x+32=198\right)\)
\(x+x\cdot\frac{\frac{1}{3}}{\frac{2}{9}}+\frac{x}{\frac{2}{7}}=252\)
\(\Leftrightarrow x+1,5x+3,5x=252\)
<=>6x=252
<=>x=42
ủng hộ nhe
y + y x 1/3 : 2/9 + y :2/7 = 252
y + y x1/3 : 2/9 + y : 2/7 = 252
y x 1 + y x ( 1/3 x 9/2 ) + y x 7/2 =252
y x1/1 + y x 3/2 + y x 7/2 =252
y x ( 1/1 + 3/2 + 7/2 ) =252
y x ( 2/2 + 3/2 + 7/2 ) =252
y x 6 = 252
y = 252 : 6
y = 42
Đáp số là???? ¿¿??????? ¿? ¿??????????? ¿
Là42
y + y x 1/3 : 2/9 + y : 2/7 = 252
y x 1 + y x 3/2 + y x 7/2 = 252
y x ( 1 + 3/2 + 7/2 ) = 252
y x 6 = 252
y = 252 : 6
y = 42
Chúc bạn học giỏi.
Bài 1 Tìm X
X+X×1/2:2/9+X:2/7=252
x+x*\(\frac{1}{2}\):\(\frac{2}{9}\)+x:\(\frac{2}{7}\)=252
x+x*\(\frac{9}{4}\)+x*\(\frac{7}{2}\)=252
x*(1+\(\frac{9}{4}\)+\(\frac{7}{2}\))=252
x*\(\frac{27}{4}\)=252
x=252:\(\frac{27}{4}\)
x=\(\frac{112}{3}\)
Vậy x=\(\frac{112}{3}\)
Học tốt
\(x+x\times\frac{1}{2}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(x\times1+x\times\frac{9}{4}+x\times\frac{7}{2}=252\)
\(x\times\left(1+\frac{9}{4}+\frac{7}{2}\right)=252\)
\(x\times\frac{17}{4}=252\)
\(x=252\div\frac{17}{4}\)
\(x=252\times\frac{4}{17}\)
\(x=\frac{1008}{17}\)
Chắc sai =]]