5/2 : 15/2 x 100% =
giúp mik sẽ cho 5 sao
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1) -12.(x-5) + 7.(3-x)=5
-12x+ 60+21-7x =5
-12x-7x = 5-60-21
-19x=-76
x=-76:(-19)
x=4
2) (x-2).(x+4) =0
\(\Rightarrow\)x-2=0 hoặc x+4=0
x-2=0 x+4=0
x=0+2 x=0-4
x=2 x=-4
Vậy x=2 hoặc x=-4
3) (x-2).(x+15) =0
\(\Rightarrow\)x-2=0 hoặc x+15=0
x-2=0 x+15=0
x=0+2 x=0-15
x=2 x=-15
1)\(-12.\left(x-5\right)+7.\cdot\left(3-x\right)=5\)
\(-12x+60+21-7x=5\)
\(-19x+81=5\)
\(-19x=5-81\)
-\(-19x=-76\)
\(x=-76:-19\)
\(x=4\)
2) Ta có 2 trường hợp
TH1: x-2=0 =>x=2
TH2: x+4=0 => x=-4
Vậy \(x\in\left(-4;2\right)\)
3) Ta có
TH1: x-2=0=>x=2
TH2: x+15=0=>x=-15
Vậy \(x\in\left(-15;2\right)\)
b) ( x+ 2) ( 3x-2) - (3x-1) ( x-5) = 11
3x^2 +6x - 2x -4 - 3x^2 +x + 15x -5 =11
20x = 11 +4+5
20x = 20
x=1
c) 2(2x+ 1) ( 8x-3) + ( 3-4x) ( 8x-7) = 6x + 73
(4x + 2)(8x-3) + 24x - 32x^2 -3 +4x = 6x +73
32x^2 + 16x - 12x + 24x - 32x^2 +4x -6x = 73 +6 +3
26x = 82
x= 41/13
a. \(\left(x+2\right)\left(3x-2\right)-\left(3x-1\right)\left(x-5\right)=11\)
\(\Rightarrow3x^2-2x+6x-4-3x^2+15x+x-5=11\)
\(\Rightarrow20x-9=11\)
\(\Rightarrow x=1\)
Vậy..................
b. \(2\left(2x+1\right)\left(8x-3\right)+\left(3-4x\right)\left(8x-7\right)=6x+73\)
\(\Rightarrow\left(4x+2\right)\left(8x-3\right)+\left(3-4x\right)\left(8x-7\right)=6x+73\)
\(\Rightarrow32x^2-12x+16x-6+24x-21-32x^2+28x-6x=73\)
\(\Rightarrow50x-27=73\)
\(\Rightarrow x=100\)
Vậy..............
a)x*4/5:2=6/7 b)6/5:x:5/4=10/15
x*4/5=6/7 x 2 6/5:x=10/15 x 5/4
x*4/5=12/7 6/5:x=5/6
x=12/7:4/5 x=6/5:5/6
x=15/7 x=36/25
a) x * 4/5 : 2 = 6/7
x * 4/5 = 6/7 *2
x *4/5 = 12/7
x = 12/7 : 4/5
x = 15/7
Vậy x = 15/7
a) -12x + 60 + 21 - 7x =15
-12x - 7x + 81 = 15
-19x = 15 - 81
-19x = -66
x= -66 : (-19)
x = \(\frac{66}{19}\)
Vậy x = \(\frac{66}{19}\)
b) 30x + 60 - 6x + 30 - 24x= 100
30x - 6x - 24x + 60 +30= 100
x ( 30 - 6- 24 ) + 90 = 100
x. 0 + 90 =100
x. 0 =10 ( vô lý )
\(\Rightarrow\) x \(\in\phi\)
a: \(A=\dfrac{16^5\cdot15^5}{2^{10}\cdot3^5\cdot5^4}=\dfrac{2^{20}\cdot3^5\cdot5^5}{2^{10}\cdot3^5\cdot5^4}=2^{10}\cdot5=5120\)
b: \(B=\dfrac{2^{15}\cdot3+2^{19}\cdot10}{2^{12}\cdot26}=\dfrac{2^{15}\left(3+2^4\cdot10\right)}{2^{13}\cdot13}=2^2\cdot\dfrac{163}{13}=\dfrac{652}{13}\)
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làm rồi
để nghỉ lại đã có thời gian thì làm hộ cho nha
\(\dfrac{5}{2}:\dfrac{15}{2}.100\%=\dfrac{5}{2}.\dfrac{2}{15}.\dfrac{100}{100}=\dfrac{5}{2}.\dfrac{2}{15}.1=\dfrac{5}{2}.\dfrac{2}{15}=\dfrac{5.2}{2.15}=\dfrac{5}{15}=\dfrac{1}{3}\)
5/2 : 15/2 x 100%
= 1/3 x 100/100
= 1/3