Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(30\left(x+2\right)-6\left(x-5\right)-24x=100\)
\(=>30x+60-6x+30-24x=100\)
\(=>0x+60+30=100\)
\(=>x\)ko tồn tai
Ủng hộ nha
Không thể tìm ra x bởi vì mình bấm trên casio ko ra kết quả bạn sai đề hoặc mình làm sai :)
\(\text{-12(x-5)+7(3-x)=5 }\)
\(-12x+60+21-7x=5\)
\(-12x-7x=5-21-60\)
\(-19x=-76\)
\(x=-76:\left(-19\right)\)
\(x=4\)
\(\text{ 30(x+2)-6(x-5)-24x=100}\)
\(30x+60-6x+30-24x=100\)
\(30x-6x-24x=100-30-60\)
\(0=10\)
\(\Rightarrow x\)ko tồn tại
\(\text{(x+1-5)+7(3-x)=5 }\)
\(x+1-5+21-7x=5\)
\(x-7x=5-21+5-1\)
\(-6x=-12\)
\(x=\left(-12\right):\left(-6\right)\)
\(x=2\)
\(\text{(x+1)+(x+3)+(x+5)+........+(x+99)=0}\)
\(\text{(x+1)+(x+3)+...+(x+99)=0}\)
tổng các số hang là\(\frac{\left(99+1\right)}{2}=50\)(số hạng)
=>\(\text{(x+1)+(x+3)+...+(x+99)=0}\)<=> \(\text{50.x+(1+3+5+..+99)=0}\)
<=>\(\text{50.x+(99+1)}\)\(.\frac{50}{2}=0\)<=> \(\text{50.x+2500=0=}\)>\(x=\frac{-2500}{50}=-50\)
chúc bạn học tốt
a, Ta có :\(-30+\left(25-x\right)=-1\)
\(\Leftrightarrow\left(-30\right)+25-x=-1\)
\(\Leftrightarrow25-x=\left(-1\right)-\left(-30\right)\)
\(\Leftrightarrow25-x=29\\ \Leftrightarrow x=25-29\)
\(\Leftrightarrow x=\left(-4\right)\)
Vậy \(x=-4\)
b,Ta có :\(\left(x+5\right)+\left(x-9\right)=x+2\)
\(\Leftrightarrow x+5+x-9=x+2\)
\(\Leftrightarrow2.x+\left(5-9\right)=x+2\)
\(\Leftrightarrow\) \(2.x+\left(-4\right)=x+2\)
\(\Leftrightarrow2.x-x=4+2\)
\(\Leftrightarrow x=6\)
Vậy \(x=6\)
<=> 30x + 60 - 2x + 10 - 24 = 30
<=> 28x + 46 =30
<=> 28x = -16
<=> x = -4/7
x+2 = 5
x = 5-2
x = 3
2x - 30 = -14
2x = -14 +30
2x = 16
x= 16:2
x=8
14x23-4x23-4(x+5) = 30
322 - 92- 4(x+5) = 30
230 - 4(x+5) = 30
4(x+5) = 230 - 30
4(x+5) = 200
x+5 = 200 :4
x+5 = 50
x = 50 - 5
x = 45
3x :35 = 45:5
3x :35 = 9 = 32
3x :35 =32
=> 3x = 32 x 35
=>3x = 37
=> x = 7
x+2=5
=> x=5-2
=> x=3.
2x-30=-14
=> 2x=-14+30
=> 2x=16
=> x=16:2
=> x=8.
14.23-4.23-4.(x+5)=30
=> 23.(14-4)-4.(x+5)=30
=> 23.10-4.(x+5)=30
=> 230-4.(x+5)=30
=> 4.(x+5)=230-30
=> 4.(x+5)=200
=> x+5=200:4
=> x+5=50
=> x=50-5
=> x=45.
3x:35=45:5
=> 3x-5=9
=> 3x-5=32
=> x-5=2
=> x=2+5
=> x=7.
\(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}=\dfrac{14}{32}-\dfrac{4}{32}+\dfrac{9}{32}=\dfrac{19}{32}\)
\(\dfrac{5}{4}-\dfrac{25}{30}\times\dfrac{37}{44}+\dfrac{-25}{30}\times\dfrac{13}{44}+\dfrac{-25}{30}\times\dfrac{-6}{44}\)
\(=-\dfrac{25}{30}\times\left(\dfrac{5}{4}+\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)\)
\(=-\dfrac{25}{30}\times\left(\dfrac{55}{44}+\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)\)
\(=-\dfrac{25}{30}\times\dfrac{99}{44}\)
\(=-\dfrac{5}{6}\times\dfrac{9}{4}\)
\(=-\dfrac{15}{8}\)
\(\left(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}\right):\dfrac{5}{4}\)
\(=\left(\dfrac{14}{32}+\dfrac{-4}{32}+\dfrac{9}{32}\right):\dfrac{5}{4}\)
\(=\dfrac{19}{32}:\dfrac{5}{4}\)
\(=\dfrac{19}{32}.\dfrac{4}{5}=\dfrac{19.4}{32.5}=\dfrac{19}{40}\)
\(\dfrac{-25}{30}.\dfrac{37}{44}+\dfrac{-25}{30}.\dfrac{13}{44}+\dfrac{-25}{30}.\dfrac{-6}{44}\)
\(=\dfrac{-25}{30}.\left(\dfrac{37}{44}+\dfrac{13}{44}+\dfrac{-6}{44}\right)\)
\(=\dfrac{-25}{30}.\dfrac{44}{44}=\dfrac{-5}{6}.1=-\dfrac{5}{6}\)
\(x+30\%\times x=5\)
\(x\times1+0,3\times x=5\)
\(x\times\left(1+0,3\right)=5\)
\(x\times1,3=5\)
\(x=5:1,3\)
\(x=\dfrac{50}{13}\)
Vậy \(x=\dfrac{50}{13}\)
_HT_