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AM NEVOIE MA AJUTA CINEVA SI PE MINE HAI CA AM NEVOIE EX 1 SUS MS

AM NEVOIE MA AJUTA CINEVA SI PE MINE HAI CA AM NEVOIE EX 1 SUS MS class=

Răspuns :

1.a.

2/5 + 3/4=

a=8+15/20=

a=23/20

1.b

3/7•(2/5+3/4)=

b=3/7•23/20=

b=69/140

1.c

3/7•2/5=

c=3•2/7•5=

c=6/36

1.d

3/7•3/4=

d=3•3/7•4=

d=9/28

1.e

3/7•2/5+3/7•3/4=

e=3•2/7•5+3•3/7•4=

e=6/35+9/28=

e=24+45/140=

e=69/140