Resposta:
Explicação passo a passo:
f) [tex]1-\frac{2}{5} +\frac{1}{2} =[/tex][tex]\frac{1}{1} -\frac{2}{5} +\frac{1}{2} =[/tex]
MMC(1,2,5)=10
10:1=10 10:5=2 10: 2=5
[tex]\frac{10*1-2*2+5*1}{10}= \frac{10-4+5}{10} =\frac{11}{10}[/tex]
g) [tex]\frac{1}{4}-\frac{2}{3}-\frac{1}{1}=[/tex]
MMC(4,3,1)=12
12:4=3 12:3=4 12:1=12
[tex]\frac{3*1-4*2-12*1}{12}=\frac{3-8-12}{12}=\frac{17}{12}[/tex]
h)0,1=1/10
[tex]\frac{1}{10}+\frac{3}{2}-\frac{3}{5}=[/tex]
MMC (10,2,5)=10
10:10=1 10: 2=5 10:5=2
[tex]\frac{1*1+5*3-2*3}{10} = \frac{1+15-6}{10} =\frac{10}{10} =1[/tex]
i) 0,5=5/10 0,7=7/10
[tex]\frac{5}{10}+\frac{1}{3}-\frac{7}{10} =[/tex]
MMC (10,3,10)=30
30:10=3 30:3=10
[tex]\frac{3*5+10*1-3*7}{30} =\frac{15+10-21}{30} =\frac{25-21}{30} =\frac{4:2}{30:2} =\frac{2}{15}[/tex]
j)[tex]-(\frac{-3}{4})+\frac{1}{2} -\frac{1}{1} +\frac{3}{2}= +\frac{3}{4}+\frac{1}{2} -\frac{1}{1} +\frac{3}{2}=[/tex]
MMC(4,2,1)=4
4:4 =1 4:2=2 4:1=4
[tex]\frac{1*3+2*1-4*1+2*3}{4} =\frac{3+2-4+6}{4} =\frac{7}{4}[/tex]
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Resposta:
Explicação passo a passo:
f) [tex]1-\frac{2}{5} +\frac{1}{2} =[/tex][tex]\frac{1}{1} -\frac{2}{5} +\frac{1}{2} =[/tex]
MMC(1,2,5)=10
10:1=10 10:5=2 10: 2=5
[tex]\frac{10*1-2*2+5*1}{10}= \frac{10-4+5}{10} =\frac{11}{10}[/tex]
g) [tex]\frac{1}{4}-\frac{2}{3}-\frac{1}{1}=[/tex]
MMC(4,3,1)=12
12:4=3 12:3=4 12:1=12
[tex]\frac{3*1-4*2-12*1}{12}=\frac{3-8-12}{12}=\frac{17}{12}[/tex]
h)0,1=1/10
[tex]\frac{1}{10}+\frac{3}{2}-\frac{3}{5}=[/tex]
MMC (10,2,5)=10
10:10=1 10: 2=5 10:5=2
[tex]\frac{1*1+5*3-2*3}{10} = \frac{1+15-6}{10} =\frac{10}{10} =1[/tex]
i) 0,5=5/10 0,7=7/10
[tex]\frac{5}{10}+\frac{1}{3}-\frac{7}{10} =[/tex]
MMC (10,3,10)=30
30:10=3 30:3=10
[tex]\frac{3*5+10*1-3*7}{30} =\frac{15+10-21}{30} =\frac{25-21}{30} =\frac{4:2}{30:2} =\frac{2}{15}[/tex]
j)[tex]-(\frac{-3}{4})+\frac{1}{2} -\frac{1}{1} +\frac{3}{2}= +\frac{3}{4}+\frac{1}{2} -\frac{1}{1} +\frac{3}{2}=[/tex]
MMC(4,2,1)=4
4:4 =1 4:2=2 4:1=4
[tex]\frac{1*3+2*1-4*1+2*3}{4} =\frac{3+2-4+6}{4} =\frac{7}{4}[/tex]