2^10x13+2^10x65/2^8x10
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2^10x13+2^10x65 phần 2^8x104
Chi tiết nha!
4^10x8^15 = ?
4^15x5^30 =?
27^16: 9^10 =?
72^3x 54^2 / 108^4 = ?
3^10x11+3^10x5 / 3^9x2^4 =?
2^10x13+ 2^10x65 / 2^8 x 104 =?
Cac ban giup minh nha
2^10x13+2^10^10x65phần2^8x104
tính nhanh: A=2/2x4 + 2/4x6 + 2/6x8 + 2/8x10
A==2/2x4+2/4x6+2/6x8+2/8x10
A=1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10
A=1/2-1/10=2/5.
Mk lam xong dau tien, k nhe
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Cx2=2/2-2/4+2/4-2/6+2/6-2/8+2/8-2/10
Cx2=2/2-2/10=10/10+-2/10=4/5
Suy ra:C=4/5:2=4/5x1/2=2/5
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tìm y:
(2/2x4 + 2/4x6 + 2/6x8 + 2/8x10) x y = 1/3
`(2/(2xx4)+2/(4xx6)+2/(6xx8)+2/(8xx10))xxy=1/3`
`=>(1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10)xxy=1/3`
`=>(1/2-1/10)xxy=1/3`
`=>(5/10-1/10)xxy=1/3`
`=>4/10xxy=1/3`
`=>2/5xxy=1/3`
`=>y=1/3:2/5`
`=>y=1/3xx5/2`
`=>y=5/6`
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2x10^3+7x10^2+8x10+7
cho a= 2/5x7 + 2/8x10 + ... + 2/2015 x 2017 so sanh a voi 13%
tính:
a) 3^13+9x3^17/ 3^11+3^7
b) 5^17+5^3/5^16+25
c) 2^10 x13 +2^10x65/ 2^8x3x13
3/4x6+3/6x8+3/8x10+.............+3/nx(n+2)=9/25