3 x X - 0.8 / X -14.5 = 15
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( 3 x - 0.8 ) : x + 14.5 = 15
( 3 x - 0.8 ) x \(\frac{1}{x}\)+ 14,5 = 15
3X x \(\frac{1}{x}\)- 0,8 x \(\frac{1}{x}\)= 0,5
\(\frac{3x}{x}-\frac{0,8}{x}=\frac{0,5x}{x}\)
=> 3x - 0,8 = 0,5x
3x - 0,5x = 0,8
2,5x = 0,8
x = 2,5 : 0,8
x = \(\frac{25}{8}=3,125\)
a ) \(x+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(x\times1+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)
\(x\times1+x\times\frac{1}{3}\times\frac{9}{2}+x\times\frac{7}{2}=252\)
\(x\times1+x\times\frac{9}{6}+x\times\frac{7}{2}=252\)
\(x\times\left(1+\frac{9}{6}+\frac{7}{2}\right)=252\)
\(x\times6=252\)
\(x=252\div6\)
\(x=42\)
b ) \(\left(3\times x-0,8\right)\div x+14,5=15\)
\(\left(3\times x-0,8\right)\div x=15-14,5\)
\(\left(3\times x-0,8\right)\div x=0,5\)
\(0,8\div x=3-0,5\)
\(0,8\div x=2,5\)
\(x=0,8\div2,5\)
\(x=0,32\)
0,24 x 450 + 0,8 x 15 x 3 + 3 x 4 x8
=0,24 x 100 x 4,5 + 0,8 x 3 x 15 + 3 x 8 x 4
=24 x 4,5 + 2,4 x 10 x 1,5 + 24 x 4
=24 x 4,5 + 24 x 1,5 + 24 x 4
=24 x (4,5 + 1,5 + 4)=24 x 10 = 240
0,24 x 450 + 0,8 x 15 x 3 + 3 x 4 x 8
= 0,24 x 100 x 45 + 0,8 x 3 x 15 + 3 x 8 x 4
= 24 x 4,5 + 2,4 x 15 + 24 x 4
= 24 x 4,5 + 24 x 1,5 + 24 x 4
= 24 x ( 4,5 + 1,5 + 4 )
= 24 x 10 = 240
\(\frac{3x-0.8}{x}+14.5=15\)
\(3-\frac{0.8}{x}=15-14.5\)
\(3-\frac{0.8}{x}=0.5\)
\(\frac{0.8}{x}=3-0.5\)
\(\frac{0.8}{x}=2.5\)
\(x=\frac{0.8}{2.5}=\frac{8}{25}\)
\(\frac{3\cdot x-0.8}{x}+14.5=15\)
\(\frac{3\cdot x-0.8}{x}=15-14.5\)
\(\frac{3\cdot x-0.8}{x}=\frac{1}{2}\)
\(2\cdot\left(3\cdot x-0.8\right)=x\cdot1\)
\(6\cdot x-1.6=x\)
\(6\cdot x-x=1.6\)
\(5\cdot x=1.6\)
\(x=1.6:5\)
\(x=0.32\)
45^10*5^20/75^15
=5^10*9^10*5^20/(5^2)^15
=5^10*5^20*9^10/5^30
=9^10
(0.8)^5/(0.4)^6
=(0.4)^5*2^5/(0.4)^6
=2^5/(0.4)
=32/(0.4)
=80
2^15*9^4/6^6*8^3
=2^15*(3^2)^4/2^6*3^6*(2^3)^3
=2^15*3^8/2^6*3^6*2^9
=3^2
=9
3*x-0/x-70=15
3*x-0=85
3*x=85
x=85/3