Matematică, întrebare adresată de Alexysady, 9 ani în urmă

Aflati x din:
a) \frac{x}{1,2} = \frac{(2,5-1 \frac{2}{3} ) ^{2} }{ \frac{5}{24} }
b) \frac{8 \frac{8}{15}*[ \frac{1}{5}+x*(1 \frac{1}{3}-1 \frac{1}{5})]*1 \frac{2}{3}   }{2,1(3)} = \frac{ 16^{8} }{ 8^{10} }

Răspunsuri la întrebare

Răspuns de finamihai
30
a) x/1,2=[(25/10-5/3)²]/(5/24)
x/1,2=[(25·3-5·10)/30]²/(5/24)
x/1,2=[(75-50)/30]²/(5/24)
x/1,2=(25/30)²/(5/24)
x/1,2=(625/900):5/24
x/1,2=625/900·24/5         simplif
x/1,2=125/450·12/1
x/1,2=(125·6)/225
x/1,2=10/3
3x=10·1,2
x=12/3
x=4

b) 8intreg8/15=(8·15+8)=128/15
1intreg1/3=(1·3+1)/3=4/3
1intreg 1/5=(1·5+1)/5=6/5
1intreg 2/3=(1·3+2)/3=5/3
2,1(3)=(213-21)/90=192/90=simplif=96/45=32/15
{128/15·[1/5+x(4/3+6/5)]·5/3}/(32/15)=(2⁴)⁸:(2³)¹⁰
{128/8·5/3·[1/5+x(4·5+6·3)/15]}/(32/15)=2³²:2³⁰
{640/24·[1/5+38x/15]}/(32/15)=2³²⁻³⁰
{80/3·(3+38x)/15}/(32/15)=2²
{16/3·(3+38x)/5}/(32/15)=4
(16·3+16·38x)/15=4·32/15
(48+608x)/15=128/15                   :15
48+608x=128
608x=128-48
608x=80
x=80/608
x=20/152=10/76=5/38
x=5/38


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