Question

urgent ex 1 si 2 daca puteti macar ex 1 la ex 2 scrie aratati ca

Answer 1

a) 2/5+3/4 ⇒(8+15)/20⇒23/20
b)3/7(2/5+3/4)=3/7•23/20=69/140
c)3/7•2/5=6/35
d)3/7•3/4=9/28
e)3/7•2/5+3/7•3/4=6/35+9/28=(6•4+9•5)/140=(24+45)/140=69/140
35=7•5
28=7•4
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cmmmc=5•7•4=20•7=140

Se observă faptul că exercițiul e are același rezultat cu punctul b.


2. 5/4(1/3-1/2) = 5/4•1/3 -5/4•1/2
5/4(1/3-1/2)=5/4(1/3-1/2)