2(2x+5)-4=16
Những câu hỏi liên quan
a) (2x-3)²=9
b) (x²-16)²-16(x-4)²=0
c) (2x/5-3/4)²-3x/5-1/4=0
d) 1/16(x-2)²=9/25(5/3x-5)²
a,(x^2-16)^2-16(x-4)^2=0
b, ( 2x/5-3/4)^2-(3x/5-1/4)^2=0
https://i.imgur.com/gxCqrM4.jpg
a,x^2+2x/(x+1)^2+3-x^2-2x/(x-1)^2+3=16/x^4+4x^2+16
b,x^2/x^2+2x+2+x^2/x^2-2x+2=5(x^2-5)/x^4+4+25/4
viết thành tích a) 25x^2-16 b)16a^2-9b^4 c) (2x+5)^2-(2x-5)^2
a: 25x^2-16=(5x-4)(5x+4)
b: 16a^2-9b^4
=(4a-3b^2)(4a+3b^2)
c: (2x+5)^2-(2x-5)^2
=(2x+5-2x+5)(2x+5+2x-5)
=4x*10=40x
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Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16
2) 2x – 35 = 15
3) 3x + 17 = 12
4) (2x – 5) + 17 = 6
5) 10 – 2(4 – 3x) = -4
6) - 12 + 3(-x + 7) = -18
Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16
7+x=-16
x=-16-7
x=-23
2) 2x – 35 = 15
2x=15+35
2x=50
x=50:2
x=25
3) 3x + 17 = 12
3x=12-17
3x=-5
x=-5/3
4) (2x – 5) + 17 = 6
2x-5=6-17
2x-5=-11
2x=-11+5
2x=-6
x=-6:2
x=-3
5) 10 – 2(4 – 3x) = -4
2(4-3x)=10-(-4)
2(4-3x)=14
4-3x=14:2
4-3x=7
3x=4-7
3x=-3
x=-3:3
x=-1
6) - 12 + 3(-x + 7) = -18
3(-x+7)=-18-(-12)
3(x+7)=-6
x+7=-6:3
x+7=-2
x=-2-7
x=-9
tự đi mà làm
Tìm số tự nhiên x biết:
a) (10-2x).(3x-18)=0 b) 10 + 2x = 165: 216 c) 28 - 2.(x - 4)2=10 d) (15-x)3.(x2 + 16) = 0 e) 52x - 3 - 2.52 = 52 . 3
f) (8 - x3).(x2 + 16) = 0 j) (2x + 5) + (2x + 10) +(2x + 15) +...+(2x + 95) = 77520
2/x+2-2x^2+16/x^3+8=5/x^2-2x+4
ĐKXĐ: x≠-2
Ta có: \(\frac{2}{x+2}-\frac{2x^2+16}{x^3+8}=\frac{5}{x^2-2x+4}\)
\(\Leftrightarrow\frac{2}{x+2}-\frac{2x^2+16}{\left(x+2\right)\left(x^2-2x+4\right)}-\frac{5}{x^2-2x+4}=0\)
\(\Leftrightarrow\frac{2\left(x^2-2x+4\right)}{\left(x+2\right)\left(x^2-2x+4\right)}-\frac{2x^2+16}{\left(x+2\right)\left(x^2-2x+4\right)}-\frac{5\left(x+2\right)}{\left(x^2-2x+4\right)\left(x+2\right)}=0\)
\(\Leftrightarrow2x^2-4x+8-\left(2x^2+16\right)-5\left(x+2\right)=0\)
\(\Leftrightarrow2x^2-4x+8-2x^2-16-5x-10=0\)
\(\Leftrightarrow-9x-18=0\)
\(\Leftrightarrow-9x=18\)
hay x=-2(ktm)
Vậy: x∈∅
tìm x
a) 4(18-5x)-12(3x-7)=15(2x-16)-6(x+14)
b) 5(3x+5)-4(2x-3)=5x+3(2x+12)+1
c) 2(5x-8)-3(4x-5)=4(3x-4)+11
a) \(\Rightarrow72-20x-36x+84=30x-240-6x-84\)
\(\Rightarrow80x=480\Rightarrow x=6\)
b) \(\Rightarrow15x+25-8x+12=5x+6x+36+1\)
\(\Rightarrow4x=0\Rightarrow x=0\)
c) \(\Rightarrow10x-16-12x+15=12x-16+11\)
\(\Rightarrow14x=4\Rightarrow x=\dfrac{2}{7}\)
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2(2x+5)-4=16
2 (2x + 5) - 4 =16
=> 2 (2x + 5) = 20
=> 2x + 5 = 20 : 2
=> 2x + 5 = 10
=> 2x = 5
=> x = 2.5 (T/M)
HỌC TỐT
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