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Помогите Пожалуйста
a) 9•157 +9•143;
б) 3,5• 2,4-3,5•1,4;.
В)4,75•3,2+3,2•3,25
г)4/5•2/3+2/3•2/5
д)1 1/3•5/14-1 1/3•1/7
е)12,9•3/8-11,3•3/8​

Răspuns :

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Răspuns:

9•157+9•143=(157+143)•9=300•9=2700

3,5•2,4-3,5•1,4=(2,4-1,4)•3,5=1•3,5=3,5

4,75•3,2+3,2•3,25=(4,75+3,25)•3,2=8•3,2=25,6

4/5•2/3+2/3•2/5=(4/5+2/5)•2/3=6/5•2/3=2/5•2/1=4/5

1 1/3•5/14-1 1/3•1/7=(5/14-1/7)•1 1/3=3/14•1 1/3=3/14•4/3=12/42

12,9•3/8-11,3•3/8=(12,9-11,3)•3/8=0,6•3/8=6/10•3/8=2/5•1/4=2/20

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