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TL
a, 100005175327
b, 148904438
c, 10746660
HT
Mình mất 5 phút để giải, bạn mất 1 giây để t.i.c.k, nhớ t.i.c.k mình nhá
\(B=\)\(\frac{3+33+333+3333+33333}{4+44+444+4444+44444}\)
\(B=\frac{3.1+3.11+3.111+3.1111+3.11111}{4.1+4.11+4.111+4.1111+4.11111}\)
\(B=\frac{3.\left(1+11+111+1111+11111\right)}{4.\left(1+11+111+1111+11111\right)}\)
\(B=\frac{3}{4}\)
\(A=\frac{1}{3}+\frac{1}{6}+\frac{1}{12}+\frac{1}{24}+\frac{1}{48}+\frac{1}{96}+\frac{1}{192}\)
\(A.2=\left(\frac{1}{3}+\frac{1}{6}+\frac{1}{12}+\frac{1}{24}+\frac{1}{48}+\frac{1}{96}+\frac{1}{192}\right).2\)
\(A.2=\frac{2}{3}+\frac{1}{3}+\frac{1}{6}+\frac{1}{12}+\frac{1}{24}+\frac{1}{48}+\frac{1}{96}\)
=>\(A.2-A=\left(\frac{2}{3}+\frac{1}{3}+\frac{1}{6}+\frac{1}{12}+\frac{1}{24}+\frac{1}{48}+\frac{1}{96}\right)-\left(\frac{1}{3}+\frac{1}{6}+\frac{1}{12}+\frac{1}{24}+\frac{1}{48}+\frac{1}{96}+\frac{1}{192}\right)\)
\(A=\frac{2}{3}-\frac{1}{192}\)
\(A=\frac{127}{192}\)
\(\frac{1995}{1997}.\frac{1990}{1993}.\frac{1997}{1994}.\frac{1993}{1995}.\frac{997}{995}\)
Đặt \(C=\frac{1995}{1997}.\frac{1990}{1993}.\frac{1997}{1994}.\frac{1993}{1995}.\frac{997}{995}\)
\(C=\frac{1995.1990.1997.1993.997}{1997.1993.1994.1995.995}\)
\(C=\frac{1990.997}{1994.995}\)
\(C=\frac{995.2+997}{997.2+995}=1\)
\(B=\frac{3+33+333+3333+ 33333}{4+44+444+4444+44444}\)
\(\Rightarrow B=\frac{3\left(1+11+111+1111+11111\right)}{4\left(1+11+111+1111+11111\right)}=\frac{3}{4}\)
So sánh 3+0,3+0,03+0,003+0,0003 và \(\frac{33333}{10000}\)
Ta có: 3+0,3+0,03+0,003+0,0003=3,3333
\(\frac{33333}{10000}\)=33333:10000=3,3333
Vì 3,3333 = 3,3333
Vậy 3+0,3+0,03+0,003+0,0003 = \(\frac{33333}{10000}\)
22222×99999
= 22222×(100000-1)
= 2222200000-22222
=222197778
22222×99999 = 22222×(100000-1) = 2222200000-22222 =222197778
\(A=\frac{3333}{4545}+\frac{1}{15}+\frac{1111}{5555}\)
\(=\frac{11}{15}+\frac{1}{15}+\frac{1}{5}\)
\(=\frac{12}{15}+\frac{3}{15}\)
\(=1\)
\(A=\frac{3333}{4545}+\frac{1}{15}+\frac{1111}{5555}\)
\(=\frac{11}{15}+\frac{1}{15}+\frac{1}{5}\)
\(=\frac{12}{15}+\frac{3}{15}\)
\(=1\)
36 + [16 - 3 * (x + 2)] = 36
13 * (x + 2) = 36 - 36
13 * (x + 2) = 0
x + 2 = 0 : 13
x + 2 = 0
x = 0 - 2
x = -2
36+[16-3*(x+2)]=36
[16-3*(x-2)] =36-36
16-3*(x-2) =0
13*(x-2) =0
(x-2) =0:13
(x-2) =0
x =0+2
x =2
suy ra x=2
nho kich minh nhe!!!!!!!!!!!!