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КОТИКМУРКОТИУК
@КОТИКМУРКОТИУК
August 2022
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Обчисли найбільш раціональним способом: а)-7,6+10,9-(-7,6)-1,9+1,09;б)4/7*(-9)-4/7*5;в)(20.4/5+1.5/12-0,8-3.1/3)*1/6.
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sedinalana
Verified answer
а)-7,6+10,9-(-7,6)-1,9+1,09=-7,6+10,9+7,6-1,9+1,09=
=(-7,6+7,6)+(10,9-1,9)+1,09=0+9+1,09=10,09
б)4/7*(-9)-4/7*5=4/7*(-9-5)=4/7*(-14)=48-2=-8
в)(20 4/5+1 5/12-0,8-3.1/3)*1/6.=108,5
1)20 4/5-0,8=20,8-0,8=20
2)20+1 5/12=21 5/12
3)21 5/12-3 1/3=21 5/12-3 4/12=18 1/12
4)18 1/12*1/6=217/12*1/6=217/2=108,5
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Answers & Comments
Verified answer
а)-7,6+10,9-(-7,6)-1,9+1,09=-7,6+10,9+7,6-1,9+1,09==(-7,6+7,6)+(10,9-1,9)+1,09=0+9+1,09=10,09
б)4/7*(-9)-4/7*5=4/7*(-9-5)=4/7*(-14)=48-2=-8
в)(20 4/5+1 5/12-0,8-3.1/3)*1/6.=108,5
1)20 4/5-0,8=20,8-0,8=20
2)20+1 5/12=21 5/12
3)21 5/12-3 1/3=21 5/12-3 4/12=18 1/12
4)18 1/12*1/6=217/12*1/6=217/2=108,5