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Va rog ajutati-ma la ex.1,2,3,4!Dau coroana!

Va Rog Ajutatima La Ex1234Dau Coroana class=

Răspuns :

1
3/10*28/9:14/30=3/10*28/9*30/14= 1/10*28/3*30/14 = 1/10*2/3*30/1 = 2/3*3/1 = 2/1 = 2

2.
6/112 +3/56:1/4 = 6/112+3/56*4/1 = 6/112+12/56= 3/56+12/56= 15/56

3.
4/15 +7/20 -1/6 = 16/60 + 21/60-10/60= 16+21-10=27/60

4.
1/5 +2/5 :1/5 -1/5= 1/5+2/5*5/1-1/5= 1/5+10/5-1/5 = 1+10-1/5= 10/5 = 2/1= 2