a
7 Determinați
numărul necunoscut din proporţiile:
X+1 7
12
-; Avem 9(x + 1) = 3.759x +9= 21 = x= -X
3 9
9
X-5 7
b
4 2
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Am adăugat o fotografie
Răspuns:
c) 3·9=5(2x-7)
27=10x-35
27+35=10x
62=10x=>x=62:10=>x=6,2
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d) 11·7=5(3x+4)
77=15x+20
77-20=15x
57=15x=>x=57/15=>x=3,8
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e) 4·2=3(5x+1)
8=15x+3
8-3=15x
5=15x=>x=5/15=>x=0,(3)