a)
[tex]\frac25+0,77=\frac4{10}+0,77=0,4+0,77=1,17[/tex]
b)
[tex]8\frac34+1,125=8,75+1,125=9,875[/tex]
c)
[tex]3\frac15-2,25=3\frac2{10}-2,25=3,2-2,25=0,95[/tex]
d)
[tex]6,8-5\frac14=6,8-5,25=1,55[/tex]
e)
[tex]\frac12*0,3=0,5*0,3=0,15[/tex]
f)
[tex]2,4:\frac35=2,4:\frac6{10}=2,4:0,6=24:6=4[/tex]
[tex]\frac25+0,77=\frac25+\frac{77}{100}=\frac{40}{100}+\frac{77}{100}=\frac{117}{100}=1\frac{17}{100}[/tex]
[tex]8\frac34+1,125=8\frac34+1\frac18=8\frac{12}{16}+1\frac{2}{16}=9\frac{14}{16}=9\frac78[/tex]
[tex]3\frac15-2,25=3\frac15-2\frac14=3\frac{4}{20}-2\frac{5}{20}=2\frac{24}{20}-2\frac5{20}=\frac{19}{20}[/tex]
[tex]6,8-5\frac14=6\frac8{10}-5\frac14=6\frac{16}{20}-5\frac{5}{20}=1\frac{11}{20}[/tex]
[tex]\frac12*0,3=\frac12*\frac3{10}=\frac3{20}[/tex]
[tex]2,4:\frac35=\frac{24}{10}*\frac53=\frac82*\frac11=\frac82=4[/tex]
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I. Zamiana ułamków zwykłych na dziesiętne
a)
[tex]\frac25+0,77=\frac4{10}+0,77=0,4+0,77=1,17[/tex]
b)
[tex]8\frac34+1,125=8,75+1,125=9,875[/tex]
c)
[tex]3\frac15-2,25=3\frac2{10}-2,25=3,2-2,25=0,95[/tex]
d)
[tex]6,8-5\frac14=6,8-5,25=1,55[/tex]
e)
[tex]\frac12*0,3=0,5*0,3=0,15[/tex]
f)
[tex]2,4:\frac35=2,4:\frac6{10}=2,4:0,6=24:6=4[/tex]
II. Zamiana ułamków dziesiętnych na zwykłe
a)
[tex]\frac25+0,77=\frac25+\frac{77}{100}=\frac{40}{100}+\frac{77}{100}=\frac{117}{100}=1\frac{17}{100}[/tex]
b)
[tex]8\frac34+1,125=8\frac34+1\frac18=8\frac{12}{16}+1\frac{2}{16}=9\frac{14}{16}=9\frac78[/tex]
c)
[tex]3\frac15-2,25=3\frac15-2\frac14=3\frac{4}{20}-2\frac{5}{20}=2\frac{24}{20}-2\frac5{20}=\frac{19}{20}[/tex]
d)
[tex]6,8-5\frac14=6\frac8{10}-5\frac14=6\frac{16}{20}-5\frac{5}{20}=1\frac{11}{20}[/tex]
e)
[tex]\frac12*0,3=\frac12*\frac3{10}=\frac3{20}[/tex]
f)
[tex]2,4:\frac35=\frac{24}{10}*\frac53=\frac82*\frac11=\frac82=4[/tex]