Tìm x, biết:
x+245-213x12:56=1344:2
Bài 1: Đặt tính rồi tính:
629 822 + 183 930 | 828 849 – 782 842 | 138 x 482 |
272 x 582 | 11572 : 44 | 52038 : 63 |
Bài 2: Tìm X, biết:
X + 173 738 = 892 381 | X – 618 722 = 17 894 | X : 283 = 183 |
X : 722 = 189 | X x 56 = 51856 | X x 47 = 40091 |
Bài 1:
629822+183930=813752
828849-782842=46007
138x482=66516
272x582=158304
11572:44=263
52038:63=826
Bài 1:
629822+183930=813752
828849-782842=46007
138x482=66516
272x582=158304
11572:44=263
52038:63=826
Tìm x biết
a) x − − 5 6 = 7 12 + − 1 4
b) − x − 1 9 = − 2 45
a) x − − 5 6 = 7 12 + − 1 4
x = − 5 6 + 7 12 + − 1 4 x = − 1 2
b) − x − 1 9 = − 2 45
x = − 1 9 + 2 45 x = − 1 15
bài 2 tìm x biết
a, - 9 . ( x - 6 ) + 20 = 56
b, ( 245 - x ) + 72 = 149
c, ( 2x- 3 ) . 7 = 35
giúp tui nhaaa
`- 9 . ( x - 6 ) + 20 = 56`
`=> -9 . ( x - 6 ) = 56-20`
`=> -9 . ( x - 6 ) =36`
`=>x-6=36:(-9)`
`=>x-6=-4`
`=>x=-4+6`
`=>x=2`
`-------------`
` ( 245 - x ) + 7^2=149`
`=>( 245 - x ) +49=149`
`=> 245 - x =149-49`
`=> 245 - x =100`
`=>x=245-100`
`=>x=145`
`------------`
`(2^x-3).7=35`
`=> 2^x-3=35:7`
`=> 2^x-3=5`
`=>2^x=5+3`
`=>2^x=8`
`=>2^x=2^3`
`=>x=3`
so sánh
a) 131 mũ 175 và 31 mũ 245
b) 2 mũ 2013 và 3 mũ 1344
Tìm x, biết:x-(5/6-x)=x-2/3
`x-(5/6 -x) =x-2/3`
`x-5/6 +x -x+2/3 =0`
`x = 5/6-2/3 = 5/6 -4/6 = 1/6`
bạn có thể giải chi tiết hơn dc ko TV Cuber
tìm x biết:
x: 2/3 = 5/2
\(x\div\dfrac{2}{3}=\dfrac{5}{2}\)
\(x=\dfrac{2}{3}\times\dfrac{5}{2}\)
\(x=\dfrac{5}{3}\)
Tìm x,biết:
x(x+1)-(x-1)(x+2)=8
x(x+1)-(x-1)(x+2)=8
\(\Leftrightarrow\)\(x^2+x-x^2-2x+x+2=8\)
\(\Leftrightarrow0x=6\left(ptvn\right)\)
\(\Rightarrow S=\varnothing\)
Tìm x, biết:
x+(x+1)+(x+2)+...+(x+30)=1240
`x+(x+1)+(x+2)+...+(x+30)=1240`
`=> (x + x + x + ... + x) + (1 + 2 + 3 +... + 30) = 1240`
`=> 31x + 465 = 1240`
`=> 31 x = 1240 - 465`
`⇒ 31x = 775`
`⇒ x = 775 : 31`
`⇒ x = 25`
\(x+\left(x+1\right)+\left(x+2\right)+...+\left(x+30\right)=1240\\ \left(x+x+...+x\right)+\left(1+2+...+30\right)=1240\\ 31x+465=1240\\ 31x=1240-465\\ 31x=775\\ x=775:31\\ x=25\)
\(x+\left(x+1\right)+\left(x+2\right)+...+\left(x+30\right)=1240\)
\(\Leftrightarrow\left(x+x+...+x\right)+\left(1+2+...+30\right)=1240\)
\(\Leftrightarrow31x+465=1240\)
\(\Leftrightarrow x=25\)
tìm x biết:x-1/x+2=x-2/x+3
x³ - x² - x = 1/3
<=> x³ = x² + x + 1/3
<=> 3x³ = 3(x² + x + 1/3)
<=> 3x³ = 3x² + 3x + 1
<=> 3x³ + x³ = x³ + 3x² + 3x + 1
<=> 4x³ = (x + 1)³
<=> ³√(4x³) = ³√(x + 1)³
<=> ³√4.x = x + 1
<=> ³√4.x - x = 1
<=> x(³√4 - 1) = 1
<=> x = 1/(³√4 - 1)
Ta có \(\frac{x-1}{x+2}=\frac{x-2}{x+3}\)
\(\Rightarrow\left(x-1\right)\left(x+3\right)=\left(x+2\right)\left(x-2\right)\)
\(\Rightarrow x^2+2x-3=x^2-4\)
\(\Rightarrow x^2-x^2+2x=-4+3\)
\(\Rightarrow2x=-1\)
\(\Rightarrow x=-\frac{1}{2}\)
Vậy \(x=-\frac{1}{2}\)