X x 6 + X x 4 = 120
(x+2)+(x+4)+(x+6)+(x+8)+x=120
(x+2)+(x+4)+(x+6)+(x+8)+x=120
=>(x+x+x+x+x)+(2+8)+(4+6)=120
=>5.x+20=120
=>5.x=100
=>x=100:5
=>x=20
[x+2] + [x+4] + [x+6] + [x+8] + x = 120
(x+2)+(x+4)+(x+6)+(x+8)+x=120
(x+x+x+x+x)+(2+4+6+8)=120
5x+20=120
5x=120-20
5x=100
x=100:5
x=20
Vậy x=20
\(\left(x+2\right)+\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+x=120\)
\(\left(x+x+x+x+x\right)+\left(2+4+6+8\right)=120\)
\(x.5+20=120\)
\(x.5=120-20\)
\(x.5=100\)
\(x=100:5\)
\(x=20\)
[ x + 2 ] + [ x + 4 ] + [ x + 6 ] + [ x + 8 ] + x = 120
[ x + 2 ] + [ x + 4 ] + [ x + 6 ] + [ x + 8 ] + [ x + 10 ] = 120
[ x + ( 2 + 4 + 6 + 8 + 10 ) ] = 120
x + 30 = 120
x = 120 : 30
x = 4.
(x+2)+(x+4)+(x+6)+(x+8)+x=120
(x+2)+(x+4)+(x+6)+(x+8)+x=120
( x + x + x + x + x ) + ( 2 + 4 + 6 + 8 ) = 120
5x + 20 = 120
5x = 120 - 20
5x = 100
x = 100 : 5
x = 20
(x+2)+(x+4)+(x+6)+(x+8)+x=120
120=5x+(2+4+6+8)
120=5x+20
=>5x=120-20
=>5x=100
=>x=100:5
=>x=20
vậy x=20.
tính hợp lí: 10 x 4^6 x 9^5+ 6^9 x 120 : 8^4 x 3^12 - 6^11
\(\dfrac{10.4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}=\dfrac{5.2.2^{12}.3^{10}+3^9.2^9.2^3.3.5}{2^{12}.3^{12}-2^{11}.3^{11}}\)
\(=\dfrac{5.2^{13}.3^{10}+2^{12}.3^{10}.5}{2^{11}.3^{11}\left(2.3-1\right)}=\dfrac{2^{12}.3^{10}.5\left(2+1\right)}{2^{11}.3^{11}.5}\)
\(=\dfrac{2^{11}.2.3^{10}.5.3}{2^{11}.3^{10}.3.5}=2\)
Giải giúp mình nhé.
Tìm x:
(x x 8) + (x x 4) - (x x 6) - ( x x 4) = 120
X x( 8+4-6-4)=120
X x 2 =120
X = 120 : 2
k mình nhé
Cho ( x + 2) + (x + 4) + (x + 6) + (x + 8) + x = 120. Giá trị của x là
\(\left(x+2\right)+\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+x=120\)
\(\left(x+x+x+x+x\right)+\left(2+4+6+8\right)=120\)
\(x\times5+20=120\)
\(x\times5=120-20\)
\(x\times5=100\)
\(x=100:5\)
\(x=20\)
\(\left(x+2\right)+\left(x+4\right)+\left(x+6\right)+\left(x+8\right)+x=120\)
\(x+2+x+4+x+6+x+8+x=120\)
\(\left(x+x+x+x+x\right)+\left(2+4+6+8\right)=120\)
\(5x+20=120\)
\(5x=100\)
\(x=20\)
y x 2 + y x 4 + y x 6 = 120
y x 2 + y x 4 + y x 6 = 120
y x ( 2+ 4 + 6 ) = 120
y x 8 = 120
y = 120 : 8
y = 15
y x 2 + y x 4 + y x 6 = 120
y x ( 2 + 4 + 6 ) = 120
y x 12 = 120
y = 120 / 12
y = 10
y x 2 + y x 4 + y x 6 = 120
y x ( 2 + 4 + 6 ) = 120
y x 12 = 120
y =120 : 12
y = 10
(3.x - 1) . (4.x - 1) . (5.x -1) . (6.x -1) - 120 = 0
tính thuận tiện :
0,8 x 120 + 4 x 2 x 6 +8 x 2 +8 x 80
Giải :
0,8 x 120 + 4 x 2 x 6 +8 x 2 +8 x 80
= 8 x 12 + 8 x 6 + 8 x 2 + 8 x 80
= 8 x ( 12 + 6 + 2 + 80 )
= 8 x 100
= 800
= 800 nha bạn
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