Question

1, Dien dau <>=  va giai thich vi sao lai dien dau do :

1a,26 + 4,b4 +5,7c ...........  a,bc + 19,99  

    mik xin cac bn lam bai nay chinh vao toi nay thu 5 /6/12/2018

Answer 1

mong cac bn giup do

Answer 2

\(\overline{1a,26}+\overline{4,b4}+\overline{5,7c}=10,26+a+4,04+\overline{0,b}+5,70+\overline{0,0c}\)

\(=\left(10,26+4,04+5,70\right)+\left(a+\overline{0,b}+\overline{0,0c}\right)\)

\(=20+\overline{a,bc}>\overline{a,bc}+1999\)

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Answer 3

Ta có: \(1a,26+4,b4+5,7c=10,26+a+4,04+0,b+5,7+0,0c\)

\(=a,bc+10,26+4,04+5,7=a,bc+30\)

Vì \(20>19,99\)nên \(a,bc+19,99< a,bc+20\)

Hay \(1a,26+4,b4+5,7c>a,bc+19,99\)

Vậy ta điền dấu >

Answer 4

thanks bn hung va nam nha