sa se afle necunoscutul din proportiile: x-2,5 supra 3,5=x supra 4 si 3x-1 supra 3x+1= 2 supra 7
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Răspunsuri la întrebare
Răspuns de
0
X-2,5 înmulțit cu 4=3,5x. X-10=3,5x. X-3,5x=10. -2,5x=10|înmulțești cu -1. 2,5x=-10|împarți la 2,5. X=4
Răspuns de
1
x-2,5/3,5=x/4
x+−5/7=1/4 x
x+−5/7−1/4 x=1/4 x−1/4 x
3/4 x+−5/7=0
3/4 x+−5/7+5/7=0+5/7
3/4 x=5/7
(4/3)*(3/4 x)=(4/3)*(5/7)
x=20/21
3x-1/3x+1= 2/7
3x+−1/3 x+1=2/7
(3x+−1/3 x)+(1)=2/7
8/3 x+1=2/7
8/3 x+1−1=2/7−1
8/3 x=−5/7
(3/8)*(8/3 x)=(3/8)*(−5/7)
x=−15/56
x+−5/7=1/4 x
x+−5/7−1/4 x=1/4 x−1/4 x
3/4 x+−5/7=0
3/4 x+−5/7+5/7=0+5/7
3/4 x=5/7
(4/3)*(3/4 x)=(4/3)*(5/7)
x=20/21
3x-1/3x+1= 2/7
3x+−1/3 x+1=2/7
(3x+−1/3 x)+(1)=2/7
8/3 x+1=2/7
8/3 x+1−1=2/7−1
8/3 x=−5/7
(3/8)*(8/3 x)=(3/8)*(−5/7)
x=−15/56
andaelena200124:
Prima nu-i corecta
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