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a 3*5*6*8*9/6*9*10*4*3=(3/3)*(5/10)*(6/6)*(9/9)*(8/4)=1*1/2*1*1*2=1
b 15*18*20*22/3*5*9*2*11*40=(15/3/5)*(18/9/2)*(20/40)*(22/11)=1*1*1/2*2=1
\(\dfrac{5}{11}+\dfrac{4}{11}=\dfrac{9}{11}\\ \dfrac{11}{10}+\dfrac{9}{10}=\dfrac{20}{10}=2\\ \dfrac{11}{12}+\dfrac{5}{12}=\dfrac{16}{12}=\dfrac{4}{3}\\ \dfrac{7}{9}+\dfrac{5}{9}=\dfrac{12}{9}=\dfrac{4}{3}\)
\(\dfrac{5}{11}+\dfrac{4}{11}=1\)
\(\dfrac{11}{10}+\dfrac{9}{10}=\dfrac{20}{10}=2\)
\(\dfrac{11}{12}+\dfrac{5}{12}=\dfrac{16}{12}=\dfrac{4}{3}\)
\(\dfrac{7}{9}+\dfrac{5}{9}=\dfrac{12}{9}=\dfrac{4}{3}\)
5/9 x 5/11 + 5/11 x 4/9
= (5/9 x 5/11) + ( 4/9 x 5/11 )
= 25/99 + 20/99
= 45/99 = 5/11
nhớ tick cho mình nha
`5/9+5/11+4/9+4/11+2/11`
`=(5/9+4/9)+(5/11+4/11+2/11)`
`=9/9+11/11`
`=1+1`
`=2`
11/9 + 18/5 -2/9 -3/5
= 11/9 - 2/ 9 + 18/5 - 3/5
= 9/9 + 15/5
= 1+ 3
= 4
A) 3\7 + 5\9 +4\7+ 4\9=(3\7+4\7) + ( 5\9 +4\9) = 7\7+9\9=63\63+63\63=126\63=42\21
b) 1\5+4\11+4\5+ 7\11=(1\5+4\5)+ (4\11+7\11)=5\5+11\11=55\55+55\55=110\55=22\11
\(\frac{5}{7}+\frac{5}{9}=\frac{45}{63}+\frac{35}{63}=\frac{80}{63}\)
\(\frac{11}{9}-\frac{11}{12}=\frac{44}{36}-\frac{33}{36}=\frac{11}{36}\)
a: =9/11(7/4+5/4)=9/11x3=27/11
b: \(=\dfrac{28}{5}\cdot\dfrac{5}{8}\cdot\dfrac{5}{4}=\dfrac{28}{8}\cdot\dfrac{5}{4}=\dfrac{140}{32}=\dfrac{35}{8}\)
c: \(=\dfrac{2}{6}+\dfrac{4}{5}\cdot\dfrac{6}{5}-\dfrac{2}{5}=\dfrac{67}{75}\)
a,=(7/4+5/4):11/9
=3:11/9
=27/11
b,=28/5.5/4.5/8
=7.5/8
=35/8
c,=1/3+24/25-2/5
=97/75-2/5
=67/75
A) 3/7 + 4/9 + 4/7 + 5/9 = ( 4/9+5/9) + ( 3/7 + 4/7) = 1+ 1 = 2
B) 1/5 + 4/11 + 4/5 + 7/11 = ( 4/11 + 7/11) + ( 1/5 + 4/5) = 1+1=2
C) 1/15 + 4/15 + 5/18 + 7/18= ( 1/15+4/15) + (5/18+7/15)= 5/15 + 12/15 = 17/15
D) 1/8 + 1/12 + 3/8 + 5/12 = (1/8 + 3/8) + ( 1/12 + 1/12) = 4/8 + 2/12 = 64/96
K nha
=(4/9+5/9)+(1/5+4/5)+(9/11+2/11)
=1+1+1
=3
4/9 + 1/5 + 9/11 + 4/5 + 5/9 + 2/11
= ( 4/9 + 5/9) + ( 1/5 + 4/5) + ( 9/11 + 2/11)
= 1 + 1 + 1
= 3