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= (26/15-7/15):19/45
=\(\dfrac{19}{15}:\dfrac{19}{45}\)
=\(\dfrac{19}{15}x\dfrac{45}{19}=\dfrac{45}{15}=3\)
\(\dfrac{26}{15}\) : \(\dfrac{19}{45}\) - \(\dfrac{7}{15}\) : \(\dfrac{19}{45}\)=( \(\dfrac{26}{15}\) - \(\dfrac{7}{15}\)) : \(\dfrac{19}{45}\)
= \(\dfrac{19}{15}\) : \(\dfrac{19}{45}\)
= 3
(18/1+12/15)+7/15=2+7/15=37/15
19/37+1/37-19/37=1/37
26/7\(\times\)(11/3-8/3)=26/7\(\times\)1=26/7
1x1x1x1/3x3x2=1/18
cho mình xin 2 k
Lời giải:
$1+2+3+....+25$
$=(1+25)+(2+24)+(3+23)+(4+22)+(5+21)+(6+20)+(7+19)+(8+18)+(9+17)+(10+16)+(11+15)+(12+14)+13$
$=\underbrace{26+26+26+...+26}_{12}+13$
$=26\times 12+13=325$
\(a)\) Mẫu số chung: 45.
\(\dfrac{2}{5}=\dfrac{2\times7}{5\times7}=\dfrac{14}{45}\\ \dfrac{13}{15}=\dfrac{13\times3}{15\times3}=\dfrac{39}{45}\\ \dfrac{19}{45}\)
b) Mẫu số chung: 16.
\(\dfrac{1}{2}=\dfrac{1\times8}{2\times8}=\dfrac{8}{16}\\ \dfrac{3}{8}=\dfrac{3\times2}{8\times2}=\dfrac{6}{16}\\ \dfrac{5}{4}=\dfrac{5\times4}{4\times4}=\dfrac{\dfrac{20}{16}\\ 7}{16}\)
= (26/15-7/15):19/45
=\(\dfrac{19}{15}:\dfrac{19}{45}\)
=\(\dfrac{19}{15}x\dfrac{45}{19}=\dfrac{45}{15}=3\)
= ( 26/15 - 7/15 ) : 19/45
= 19/15 : 19/15
=1