Tìm các chữ số a,b,c sao cho:a nhân bc =145
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TN
0
NT
1
PQ
1
NL
Nguyễn Lê Phước Thịnh
CTVHS
9 tháng 1
Ta có: \(\overline{a,5}\times\overline{3,bc}=7,85\)
=>\(\left(a+0,5\right)\times\left(3+0,1b+0,01c\right)=7,85\)
=>3a+0,1ab+0,01ac+1,5+0,05b+0,005c=7,85
=>a=2; b=1; c=4
HT
1
Y
1
15 tháng 6 2016
Ta có: a + b + 8 chia hết cho 3
và a - b =3
Vậy a =8 và b =5
T
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1
NL
Nguyễn Lê Phước Thịnh
CTVHS
26 tháng 3
Ta có: \(\frac{1}{x^2-4}=\frac{a}{x-2}+\frac{b}{x+2}\)
=>\(\frac{a\left(x+2\right)+b\left(x-2\right)}{\left(x-2\right)\left(x+2\right)}=\frac{1}{\left(x-2\right)\left(x+2\right)}\)
=>a(x+2)+b(x-2)=1
=>x(a+b)+2a-2b=1
=>a+b=0 và 2a-2b=1
=>a+b=0 và a-b=1/2
=>\(a=\left(0+\frac12\right):2=\frac12:2=\frac14;b=a=-\frac14\)
a=5
b=2
c=9