Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(105^5.105^6\div105^8-105^3+105^7\)
\(=105^{11}\div105^8-105^3+105^7\)
\(=105^3-105^3+105^7\)
\(=0+105^7\)
\(=105^7\)
\(a,12-\left(4+105-13\right)+\left(4+105-3\right)\)
\(=12-4-105+13+4+105-3\)
\(=12+\left(-4+4\right)+\left(-105+105\right)+\left(13-3\right)\)
\(=12+0+0+10\)
\(=22\)
\(b,-15+\left(-17+21-35\right)+\left(4+105-13\right)\)
\(=-15-17+21-35+4+105-13\)
\(=\left(-15-35\right)+\left(-17-13\right)+\left(21+4+105\right)\)
\(=-50-30+130\)
\(=-50+100\)
\(=50\)
\(c,\left(\left|-5\right|+\left|+7\right|+\left|-9\right|\right)-\left(\left|+5\right|+\left|-7\right|+9\right)\)
\(=\left(5+7+9\right)-\left(5+7+9\right)\)
\(=0\)
`#3107`
`a)`
`(x - 20)^3 = -64`
`\Rightarrow (x - 20)^3 = (-4)^3`
`\Rightarrow x - 20 = -4`
`\Rightarrow x = -4 + 20`
`\Rightarrow x = 16`
Vậy, `x = 16.`
`b)`
`9(x + 1) - 11(x + 7) = 105 - 1`
`\Rightarrow 9(x + 1) - 11(x + 7) = 104`
`\Rightarrow 9x + 9 - 11x - 77 = 104`
`\Rightarrow (9 - 11)x + (9 - 77) = 104`
`\Rightarrow -2x - 68 = 104`
`\Rightarrow -2x = 104 + 68`
`\Rightarrow -2x = 172`
`\Rightarrow x = 172 \div (-2)`
`\Rightarrow x = -86`
Vậy,` x = -86.`
a) Ta có ( x - 20 )3 = -64 = ( -4 )3
⇒ x - 20 = -4
⇒ x = 20 + ( -4 ) = 16
b) Ta có 9 ( x + 1 ) - 11 ( x + 7 ) = 105 - 1
⇒ 9x + 9 - 11x - 77 = 104
⇒ ( -2 ) . x - 68 = 104
⇒ ( -2 ) . x = 104 - 68 = 36
⇒ x = 36 : ( -2 ) = -18
(-105) . 19 + (-76) . 105 - 5 . 105
= 105 . (-19) + (-76) . 105 - 5 . 105
= 105 . [(-19) + (-76) - 5]
= 105 . (-100)
= -10500
= ( - 105 )( 19 - 76 - 5 )
= ( - 105 )( - 62 )
= 6510
\(=\dfrac{\left(105+3\right)\left[\left(105-3\right):2+1\right]}{2}=\dfrac{108\cdot52}{2}=2808\)
\(105^x.105^3=105^7\)
\(105^x=105^7:105^3\)
\(105^x=105^4\)
\(=>x=4\)
105x . 1053 = 1057
105x = 1057 - 1053
=> x = 7 - 3
x = 4