5-2/3 ; 5/2
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\(a.=\left(\dfrac{4}{5}.\dfrac{5}{6}\right).\dfrac{2}{3}=\dfrac{4}{6}.\dfrac{2}{3}=\dfrac{4}{9}\)
\(b.\dfrac{4}{5}.\dfrac{3}{4}+\dfrac{5}{4}.\dfrac{3}{4}=\dfrac{3}{5}+\dfrac{15}{16}=\dfrac{123}{80}\)
\(c.\left(\dfrac{11}{23}+\dfrac{9}{23}\right)+\left(\dfrac{2}{23}+\dfrac{18}{23}\right)=\dfrac{20}{23}+\dfrac{20}{23}=\dfrac{40}{23}\)
\(d.\left(\dfrac{27}{12}-\dfrac{25}{36}\right)+\left(\dfrac{17}{6}-\dfrac{15}{6}\right)=\dfrac{14}{9}+\dfrac{1}{3}=\dfrac{17}{9}\)
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Giải:
17/13.18/23-4/13.18/23-(-5/23)
=18/23.(17/13-4/13)+5/23
=18/23.1+5/23
=18/23+5/23
=1
Chúc bạn học tốt!
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\(\dfrac{-5}{23}\cdot\dfrac{17}{26}+\dfrac{5}{-23}\cdot\dfrac{9}{26}\)
= \(\dfrac{-5}{23}\cdot\dfrac{17}{26}+\dfrac{-5}{23}\cdot\dfrac{9}{26}\)
= \(\dfrac{-5}{23}\left(\dfrac{17}{26}+\dfrac{9}{26}\right)\)
= \(\dfrac{-5}{23}\cdot1=\dfrac{-5}{23}\)
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A) 1243 : {23 . 2 [14 + 23 . (34 - 23) + 12]} - 21 . 2
B) 23 . 25 + 23 . 76 - 23
= 23 . 25 + 23 . 76 - 23 . 1
= 23 . ( 76 + 25 - 1 )
= 23 . 100
= 2300
C) 45 : 5 + 34 . 3
= 9 + 34/3
= 61/3
B ) 23 . 25 + 23 . 76 - 23
23 . ( 25 + 76 )
23 . 101
2323
C ) 45 : 5 + 34 . 3
9 + 102
111
Mình chỉ làm 2 câu thôi phiền cậu lm nốt câu A nhé
k cho mik nha
`5-2/3:5/2=5-2/3xx2/5=5-4/15=75/15-4/15=71/15`
bằng 71/15 nhé bạn