Пошаговое объяснение:
1)
2 5/13•1 11/15+1 1/13•1 11/15=
=1 11/15•(2 5/13+1 1/13)= 1 11/15•3 6/13=
=26/15•45/13=(26•45)/(15•13)=2•3=6
2)
3 1/14•9 1/3+13/28•9 1/3-9 1/3•1 2/7=
=9 1/3•(3 1/14+13/28-1 2/7)=
=9 1/3•(3 2/28+13/28-1 8/28)=
=9 1/3•2 7/28=28/3•63/28=
=(28•63)/(3•28)=21
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Answers & Comments
Пошаговое объяснение:
1)
2 5/13•1 11/15+1 1/13•1 11/15=
=1 11/15•(2 5/13+1 1/13)= 1 11/15•3 6/13=
=26/15•45/13=(26•45)/(15•13)=2•3=6
2)
3 1/14•9 1/3+13/28•9 1/3-9 1/3•1 2/7=
=9 1/3•(3 1/14+13/28-1 2/7)=
=9 1/3•(3 2/28+13/28-1 8/28)=
=9 1/3•2 7/28=28/3•63/28=
=(28•63)/(3•28)=21