225⁰+5².(x+5)=251
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\(25+5x-4^3=251\)
\(\Rightarrow25+5x=315\)
\(\Rightarrow5x=315-25\)
\(\Rightarrow5x=290\)
\(\Rightarrow x=290:5=58\)
\(25+x.5-4^3=251\)
\(\Rightarrow25+x.5-64=251\)
\(\Rightarrow x.5=251+64-25\)
\(\Rightarrow x.5=290\)
\(\Rightarrow x=58\)
Vậy \(x=58\)
(15+x).5+x=225
<=>75+5x+x=225
<=>6x=150
<=>x=15
Vậy tập nghiệm S={15}
4/15 + 1/2
= 8/30 + 15/30
= 23/30
51/9 - 2/3
= 51/9 - 6/9
= 45/9
= 5
3/4 × 15/26
= 45/104
7/3 : 5/14
= 7/3 × 14/5
= 98/15
a,\(x\div6=257-251\)
\(x\div6=6\)
\(x=1\)
b,\(x\times5=360-320\)
\(x\times5=40\)
\(x=8\)
a
x : 6 = 257 - 251
x : 6 = 6
x = 6 x 6
x = 36
b
X x 5 = 360 - 320
X x 5 = 40
X = 40 : 5
X = 8
a: \(\left(x+5\right)^2-\left(x-5\right)^2-2x+1=0\)
=>\(x^2+10x+25-\left(x^2-10x+25\right)-2x+1=0\)
=>\(x^2+8x+26-x^2+10x-25=0\)
=>18x+1=0
=>\(x=-\dfrac{1}{18}\)
b: \(\left(2x-7\right)^2-\left(x+3\right)^2=3x^2+6\)
=>\(4x^2-28x+49-\left(x^2+6x+9\right)-3x^2-6=0\)
=>\(x^2-28x+43-x^2-6x-9=0\)
=>34-34x=0
=>34x=34
=>x=1
c: \(\left(3x+2\right)^2-9\left(x-5\right)\left(x+5\right)=225-5x\)
=>\(9x^2+12x+4-9\left(x^2-25\right)-225+5x=0\)
=>\(9x^2+17x+4-225-9x^2+225=0\)
=>17x+4=0
=>x=-4/17
a,
\(\left(x-5\right)^2=225\)
\(\left(x-5\right)^2=15^2\)
\(\Rightarrow x-5=15\)
\(x=15+5\)
\(x=20\)
Vậy...
b.
\(\left(x-2\right)^5=32\)
\(\left(x-2\right)^5=2^5\)
\(\Rightarrow x-2=2\)
\(x=2+2\)
\(x=4\)
Vậy...
\(\Rightarrow1+25\left(x+5\right)=251\\ \Rightarrow25\left(x+5\right)=250\\ \Rightarrow x+5=10\Rightarrow x=5\)