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kết quả bằng 45 nhé bạn, nhá, mình kết bạn với bạn rồi đó
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a) Vì 4 < 5 nên \(\frac{3}{4}>\frac{3}{5}\)
b) Vì 4 < 5 nên \(\frac{4}{7}< \frac{5}{7}\)
c) Ta có :
\(\frac{2}{7}=\frac{2\times5}{7\times5}=\frac{10}{35}\)
\(\frac{4}{5}=\frac{4\times7}{5\times7}=\frac{28}{35}\)
Vì 10 < 28 nên \(\frac{10}{35}< \frac{28}{35}\)hay \(\frac{2}{7}< \frac{4}{5}\)
d) Ta có :
\(\frac{8}{9}=\frac{8\times10}{9\times10}=\frac{80}{90}\)
\(\frac{9}{10}=\frac{9\times9}{10\times9}=\frac{81}{90}\)
Vì 80 < 81 nên \(\frac{80}{90}< \frac{81}{90}\)hay \(\frac{8}{9}< \frac{9}{10}\)
e) Ta có :
\(\frac{10}{9}=\frac{10\times2}{9\times2}=\frac{20}{18}\)
Vì 19 < 20 nên \(\frac{19}{18}< \frac{20}{18}\)hay \(\frac{19}{18}< \frac{10}{9}\)
f) Ta có :
\(\frac{8}{3}=\frac{8\times4}{3\times4}=\frac{32}{12}\)
\(\frac{5}{6}=\frac{5\times2}{6\times2}=\frac{10}{12}\)
Vì 32 > 10 nên \(\frac{32}{12}>\frac{10}{12}\)hay \(\frac{8}{3}>\frac{5}{6}\)
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\(\text{5 × 4 × 7 × 1 × 8 × 9 × 2 × 4 × 6 × 100 ÷20 =}\text{2419200}\)
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1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9+10+10 = 110
HT
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
=(20+1)+(2+19)+...+(10+11) có 10 cặp số
=21+21+..+21 Có 10 số hạng
=21 x 10
=210
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5/7-4/9=17/63
3/8+9/5=87/40
1-5/9=4/9
7/12-2/7+1/12=8/21
12/17-5/17-4/17=3/17
4+6+7+9+7+9+7+9+7+8+9+4
= ( 4 + 6 ) + ( 7 + 7 + 7 + 7 ) + ( 9 + 9 + 9 + 9 ) + 8 + 4
= 10 + 7 x 4 + 9 x 4 + 8 + 4
= ( 10 + 28 ) + ( 36 +4 )
= 38 + 40
= 78
=86 nhé bạn