Toán Lớp 4: 4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
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Toán Lớp 4: 4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
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$\#Hae$
$\text{Giải đáp:}$
4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
= 2/10+3/10+4/10+5/10+6/10+7/10+8/10+9/10
$=$ $\dfrac{2+3+4+5+6+7+8+9}{10}$
= 44/10 = 22/5 = 4,4
$\dfrac{4}{20}+\dfrac{9}{30}+\dfrac{16}{40}+\dfrac{25}{50}+\dfrac{36}{60}+\dfrac{49}{70}+\dfrac{64}{80}+\dfrac{81}{90}$
$=\dfrac{1}{5}+\dfrac{3}{10}+\dfrac{2}{5}+\dfrac{1}{2}+\dfrac{3}{5}+\dfrac{7}{10}+\dfrac{4}{5}+\dfrac{9}{10}$
$=\dfrac{10}{5}+\dfrac{3}{10}+\dfrac{1}{2}+\dfrac{7}{10}+\dfrac{9}{10}$
$=\dfrac{10}{5}+\dfrac{19}{10}+\dfrac{1}{2}$
$=\dfrac{20}{10}+\dfrac{19}{10}+\dfrac{5}{10}$
$=\dfrac{20+19+5}{10}$ $=\dfrac{44}{10}$
$=\dfrac{22}{5}$