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5/6 x 4/19 + 7/12 x 4/19 + 18/19
=(5/6+7/12)×(4/19+18/19)
= 17/12×22/19
= 187/114
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Sửa đề: Tính M/N
\(\dfrac{M}{N}=\dfrac{\dfrac{7}{4}-\dfrac{7}{18}-\dfrac{7}{19}}{\dfrac{11}{4}-\dfrac{11}{18}-\dfrac{11}{19}}\)
\(=\dfrac{7\left(\dfrac{1}{4}-\dfrac{1}{18}-\dfrac{1}{19}\right)}{11\left(\dfrac{1}{4}-\dfrac{1}{18}-\dfrac{1}{19}\right)}=\dfrac{7}{11}\)
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=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+10+20
=20x10+10
=210
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\(12x\frac{19}{18}=\frac{144}{9}\)
\(15:\frac{25}{4}=15.\frac{4}{25}=\frac{12}{5}\)
\(\frac{5}{9}x\frac{6}{15}=\frac{2}{9}\)
\(\frac{4}{7}:\frac{24}{5}=\frac{4}{7}.\frac{5}{24}=\frac{5}{42}\)
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20=210 nha bn
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\(\dfrac{12}{32};\dfrac{12}{31}\)