tìm x: x :23 + 345=571 mình đang cần gấp :'(
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a)\(x^{23}=64.x^{20}\)
\(\Leftrightarrow\frac{x^{23}}{x^{20}}=64\)
\(\Leftrightarrow x^3=64\Rightarrow x=4\)
b)\(\left(4x-3\right)^4=3-4x\)
\(\Leftrightarrow\left(3-4x\right)^4=3-4x\)
\(\Leftrightarrow\left(3-4x\right)^3=1\)
\(\Leftrightarrow3-4x=1\)
\(\Leftrightarrow x=\frac{1}{2}\)
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Trả lời :
a, - (x + 84) + 213 = - 16
=> - x - 84 + 213 = -16
=> - x + 129 = - 16
=> - x = - 145
=> x = 145
b, (x - 345) - 476 = (975 - 761) - (315 + x)
=> x - 345 - 476 = 214 - 315 - x
=> x - 821 = - 101 - x
=> x + x = - 101 + 821
=> 2x = 720
=> x = 360
c, x - (35 - x) = 15 - x
=> x - 35 + x = 15 - x
=x + x + x = 15 + 35
=> 3x = 50
=> x = \(\frac{50}{3}\)
a, \(-\left(x+84\right)+213=-16\Leftrightarrow-x-84=-229\Leftrightarrow x=145\)
b, \(\left(x-345\right)-476=\left(975-761\right)-\left(315+x\right)\)
\(\Leftrightarrow x-345-476=214-315-x\Leftrightarrow2x=720\Leftrightarrow x=360\)
c, \(x-\left(35-x\right)=15-x\Leftrightarrow x-35+x=15-x\Leftrightarrow x=50\)
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a)
\(13x+3=16\\ 13x=16-3\\ 13x=13\\ x=13:13\\ x=1\)
b)
\(2x-138=24:23\\ 2x-138=\dfrac{24}{23}\\ 2x=\dfrac{24}{23}+138\\ 2x=\dfrac{3198}{23}\\ x=\dfrac{3198}{23}:2\\ x=\dfrac{1599}{23}\)
@ Nguyễn Quốc Đạt em bị nhầm đề bài nhé
2\(x\) - 138 = 24 : 23
2\(x\) - 138 = 2
2\(x\) = 2 + 138
2\(x\) = 140
\(x\) = 140 : 2
\(x\) = 70
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\((x - 3).(2y + 1) = 7\)
Ý của bạn là chỉ yc tìm mỗi vế của biến x ạ?
\(\left(x-3\right)\cdot\left(2y+1\right)\in\text{Ư}\left(7\right)=\left\{1;7;-1;-7\right\}\)
`\Rightarrow \text {TH1:} x - 3 = 1`
`\Rightarrow x = 1 + 3`
`\Rightarrow x = 4`
`\text {TH2:} x - 3 = 7`
`\Rightarrow x = 7 + 3`
`\Rightarrow x = 10`
`\text {TH3:} x - 3 = -1`
`\Rightarrow x = -1 + 3`
`\Rightarrow x = 2`
`\text {TH4:} x - 3 = -7`
`\Rightarrow x = -7 + 3`
`\Rightarrow x = -4`
Vậy, `x \in {-4; 4; 2; 10}`
ta có
trường hợp 1:(x-3)=7
x-3=7
x=7+3
x=10
x-3=7
x=7+3
x=10
trường hợp 2:(x-3)=1
x-3=1
x=1+3
x=4
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\(13.\left(23+22\right)-3.\left(17+28\right)\)
\(=13.23+22-3.17+28\)
\(=13.\left(23+17\right)-3\left(22+28\right)\)
\(=13.40-3.50\)
\(=520-150=370\)
\(-48+48.\left(-78\right)+48.\left(-21\right)\)
\(=48.\left[-78+\left(-21\right)-1\right]\)
\(=48.\left(-100\right)=-4800\)
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a) \(g\left(x\right)=x+1=x-\left(-1\right)\)
Áp dụng định lý Bê-du có số dư của \(f\left(x\right)\)cho \(g\left(x\right)\)là :
\(f\left(-1\right)=1+\left(-1\right)^2+\left(-1\right)^4+....+\left(-1\right)^{100}\)
\(=1+1+1+...+1\)
( \(\frac{100-0}{2}+1=51\)số \(1\))
\(=51\)
Vậy ...
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Bài làm :
\(a,2.x-3=185\)
\(2.x=185+3\)
\(2.x=188\)
\(x=94\)
\(b,357-\left(2.x-23\right)=122\)
\(2.x-23=357-122\)
\(2.x-23=235\)
\(2.x=258\)
\(x=129\)
\(c,152+\left(x+231\right):2=358\)
\(\left(x+231\right):2=358-152\)
\(\left(x+231\right):2=206\)
\(x+231=412\)
\(x=181\)
Học tốt nhé
x:23+345=571
x:23=571-345
x:23=226
x=226x23
x=5198
HT Ạ
@@@@@@
x:23 + 345 = 571
x:23 = 571 - 345
x:23 = 226
x = 226 x 23
x = 5198.