11/19+19/18+8/19-1/18+5,2
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Trả lời:
\(10+11+12+13+14+15+16+17+18+19+20\)
\(=\left(10+20\right)+\left(11+19\right)+\left(12+18\right)+\left(13+17\right)+\left(14+16\right)+15\)
\(=30+30+30+30+30+15\)
\(=165\)
\(1+2+3+4+5+6+7+8+9\)
\(=\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5\)
\(=10+10+10+10+5\)
\(=45\)
10+11+12+13+14+15+16+17+18+19+20
(10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15
30+30+30+30+30+15
165
\(\frac{11}{19}+\frac{19}{18}+\frac{8}{19}-\frac{1}{18}+5,2\)
\(=\left(\frac{11}{19}+\frac{8}{19}\right)+\left(\frac{19}{18}-\frac{1}{18}\right)+5,2\)
\(=1+1+5,2\)
\(=7,2\)
\(\frac{11}{19}+\frac{19}{18}+\frac{8}{19}-\frac{1}{18}+5,2\)
\(=\left(\frac{11}{19}+\frac{8}{19}\right)+\left(\frac{19}{18}-\frac{1}{18}\right)+5,2\)
\(=\frac{19}{19}+\frac{18}{18}+5,2\)
\(=1+1+5,2=7,2\)
A=(17^18+1)/(17^19+1)
17A=17(17^18+1)/17^19+1=17^19+17/17^19+1
17A=(17^19+1)+16/(17^19+1)=1+16/17^19+1
B=(17^17+1)/(17^18+1)
17B=17(17^17+1)/17^18+1=17^18+17/17^18+1
17B=(17^18+1)+16/(17^18+1)=1+16/17^18+1
Từ (1) và (2)⇒1+16/17^19+1<1+16/17^18+1
=> 17A<17B
Hay A<B
Vậy A<B
Tính từ | so sánh hơn | so sánh nhất |
1.modern | more modern | the most modern |
2.beautiful | more beautiful | the most beautiful |
3.early | earlier | the earliest |
4.safe | safer | the safest |
5.bad | worse | the worst |
6.little | less | the least |
7.few | less | the least |
8.wonderful | more wonderful | the most wonderful |
9.pretty | prettier | the prettiest |
10.easy | easier | the easiest |
11.far | further | the furthest |
12.narrow | narrower | thenarrowest |
13.different | more different | the most different |
14.smart | smarter | the smartest |
15.hot | hotter | the hottest |
16.cool | cooler | the coolest |
17.good | better | best |
18.large | larger | largest |
19.serious | more serious |
the most serious
\(A=\dfrac{6}{19}\cdot\dfrac{-7}{11}+\dfrac{6}{19}\cdot\dfrac{-4}{11}+\dfrac{-13}{19}\)
\(=\dfrac{6}{19}\left(-\dfrac{7}{11}-\dfrac{4}{11}\right)-\dfrac{13}{19}\)
\(=\dfrac{-6}{19}-\dfrac{13}{19}=-1\)
11/19+19/18+8/19-1/18+5,2
=(1/19+8/19)+(19/18-1/18)+26/5
= 9/19+18/18+26/5
=9/19+1+26/5
=9/19+19/19+26/5
=28/19+26/5
=33/95+494/95 (quy đồng)
=527/95.
Chúc bạn học tốt !
11/19+19/18+8/19-1/18+5,2 = 7,2
chúc bạn học tốt