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va rog ajutati-ma (ecuatie)
13 supra 4 - 2x =2,25 +x


Răspuns :

13/4-2x=2,25+x=> 2x-x=225/100-13/4=> x=41/4-13/4=> x=28/4=> x=7
13/4-2x=2,25+x
13/4-2,25=x+2x
2,25=9/4
13/4-9/4=3x
4/4=3x
4/4=1
1=3x
x=1/3

verificare:
13/4-2(1/3)=2,25+1/3
13/4-2/3=9/4+1/3
3*13/4*3  - 2*4/3*4= 3*9/4*3 + 4*1/3*4
39/12-8/12=27/12+4/12
31/12=31/12