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Catamarius09
a fost răspuns

Calculati in doua moduri:
a)3/5•(1/9+4/9)
b)⅔•(1/6+5/24)
c)1/7•(7/15-3/10).

Răspuns :

Renatemambouko
a)3/5•(1/9+4/9) = 3/5•1/9+3/5•4/9 =1/15+4/15=5/15=1/3
a)3/5•(1/9+4/9) = 3/5•5/9=15/45=1/3


b)⅔•(1/6+5/24)=2/3•1/6+2/3•5/24=1/9+5/36=4/36+5/36=9/36=1/4
b)⅔•(1/6+5/24) =2/3•(4/24+5/24)=2/3•3/8=1/4

c)1/7•(7/15-3/10).=1/7•7/15-1/7•3/10=1/15-3/70=(14-9)/210=5/210=1/42
c)1/7•(7/15-3/10).=1/7•(14/30-9/30)=1/7•5/30=1/7•1/6=1/42

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