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\(\frac{19}{11}+\left(\frac{8}{13}+\frac{3}{11}\right)=\frac{19}{11}+\frac{8}{13}+\frac{3}{11}\)
\(=\left(\frac{19}{11}+\frac{3}{11}\right)+\frac{8}{13}=2+\frac{8}{13}\)
\(=\frac{26}{13}+\frac{8}{13}=\frac{34}{13}\)
\(\frac{19}{11}+\left(\frac{8}{13}+\frac{3}{11}\right)\)
= \(\frac{19}{11}+\frac{8}{13}+\frac{3}{11}\)
= \(\left(\frac{19}{11}+\frac{3}{11}\right)+\frac{8}{13}\)
= 2 + \(\frac{8}{13}\)
= \(\frac{34}{13}\)
k mình nhé mình trả lời nhanh nhất , đầy đủ nhất và đúng nhất
\(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{2}{5}+\frac{16}{11}+\frac{19}{13}=\left(\frac{3}{5}+\frac{2}{5}\right)\left(\frac{6}{11}+\frac{16}{11}\right)\left(\frac{7}{13}+\frac{19}{13}\right)=1+2+2=5\)
Ta có:3/5+2/5=5/5=1; 6/11+16/11=22/11=2; 7/13+19/13=26/13=2
kết quả là 1+2+2=5
\(\dfrac{5}{13}\times\dfrac{7}{11}+\dfrac{5}{13}\times\dfrac{2}{11}+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{5}{13}\times\left(\dfrac{7}{11}+\dfrac{2}{11}\right)+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{5}{13}\times\dfrac{9}{11}+\dfrac{8}{13}\times\dfrac{9}{11}\)
\(=\dfrac{9}{11}\times\left(\dfrac{5}{13}+\dfrac{8}{13}\right)\)
\(=\dfrac{9}{11}\times1\)
\(=\dfrac{9}{11}\)
a) \(20,23\times21+20,23\times80-20,23\)
\(=20,23\times\left(21+80-1\right)\)
\(=20,23\times100\)
\(=2023\)
9976+865)+135=976+(865+135)=976+1000=1976
891+(799+109)=(891+109)+799=1000+799=1799
(2/5+1/9)+3/5=(2/5+3/5)+1/9=1+1/9=9/9+1/9=10/9
19/11+(8/13+3/11)=(19/11+3/11)+8/13=22/11+8/13=22/11+8/13=2+8/13=26/13+8/13=34/13
16.88+9.76+3.12=(16.88+3.12)+9.76=20+9.76=29.76
72.68+17.16+82.64=72.68+(17.16+82.64)=72.68+100=172.68
(19+1)+(18+2)+(17+3)+(16+4)+(15+5)+(14+6)+(13+7)+(12+8)+(11+9)+20)+10
=20+20+20+20+20+20+20+20+20+20=(20*10)+10
=210
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+(10+20)
=20+20+20+20+20+20+20+20+20+30
=(20 x 9) + 30
=180 + 30
=210
tk nha
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{5}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+1\)
\(=2\)
2,07 + 4,15 + 17,93 + 5,85
= (2,07 + 17,93) + (4,15 + 5,85)
= 20 + 10
= 30
19/11 + ( 8/13 + 3/11 )
=( 19/11+3/11 )+8/13
=2+8/13
=26/13+8/13
=34/13